004/0. Solid Rigid Shaft to Shaft Couplings Design Equations and Calculator. ; Retail. K s = K a K d / K w. size of the chamfer, various sizes related to keyway, number and positions of tapped and counterbore holes,, etc. 4- Some internal Grade values must be rounded down to a precision of 3 decimal metric millimeter precision. For those of us that machine the bigger key cuts in shafting that's not in the MHB, here's a neat calculator: Shaft Keyway Depth Calculator - CNCexpo. We're making deals better for everyone - Keyway. And the dimension is added from the bottom of the keyway to the bottom perimeter of. A list of standard K s = K a K d / K f. Cylinder Manufacturer: This identifies the manufacturer of the actual cylinder used for that brand’s keyed door hardware. CNC Machinist Calculator Pro is a machining calculator designed for manufacturing engineers, machinists, CNC operators, tool & die makers, and at home hobbyists. 2180 Corporate Lane, Suite 104 ~ Naperville, IL 60563 USA Phone (630) 596-9000 Fax (630) 596-9002 Keyway AGMA 9002-A86 Inch Bore and ANSI B17. 2388 State Route 726 Eaton, Ohio 45320 (937) 456-2232 Fax (937) 456-2282 webmaster@kramerusa. Mount the adapter to the workpiece shaft using a full key in the shaft keyway and fill the half-key void in the opposite side of the adapter with a half-key (see Figure 6-22 B). com - the worlds easiest online calculator for drive shafts, parallel keys, etc. Mech. , 2015 DESIGN OF MARINE PROPULSION SHAFTING SYSTEM FOR 53000 DWT BULK CARRIER Venkatesh Boddapati 1*, Sura Sanyasi Rao 1, Kakarla Sumanth and Jayavarapu Manideep *Corresponding Author: Venkatesh Boddapati, venkateshboddapati@hotmail. The tolerances defined in ISO 286-1 are applicable to size range from 0 mm to 3150 mm but there are exceptional cases defined in the. Having cut a number of keyways, short and long lenghts. Parallel keys and corresponding key seats are standardized component by ANSI B17. Select the Material. It is obtained by dividing the factory expenses associated with the machine for a given period by the number of hours worked by the machine during that period. Keyways for rectangular or square parallel keys. Sometimes, parts can be stacked for simultaneous cutting, thus reducing cutting time and cost. mm . Select the Machine. 3 10 8 39 44 12 3. Keys standard metric keyways mechanicalMetric keyway shaft depth reference dimensions diameter iso r773 width Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k keyKeyway metric dimensions keys. Enter cuts for the Control Key (if applicable) Enter cuts for the first Master Key or Change Key. In this calculation, the process of natural convection for a horizontal flat surface sized A × B and surface temperature Ts is considered. Enter the No. 4 3 3 11 12 4 1. W lock washers are locking devices, used to secure AN and N lock nuts onto a shaft or adapter sleeve and prevent unintentional loosening. The last two digits give the nominal diameter B in eighths of an inch and the digits preceding the last two give the nominal width W in thirty. , (2016) . 002, -. For economic manufacturing of oriented keyways and splines. B. τ = T*ρ / Ip. Varies with b / r as follows. The housing locates the bearings on their outer rings and receives the thrust loads. of keystock sufficient to clamp the ends without bowing and mill. An upturned shear key, cast as part of. It's also a…SAE – AISI 1008 Physical Properties. Keyway height calculator from the bottom of bore to top of keyway. Below you will find downloadable and printer-friendly Speeds & Feeds for each one of our products! All posted parameters are suggested starting values that may be increased given optimal setup conditions. Solid shaft without keyway Solid shaft with spline DIN 5480 Hollow shaft with spline DIN 5480 4. The dimension from the top of the keyway to the opposite bore side, “T-dim”, is calculated from (refer to ANSI/AGMA 9002-B04) the following: T = bore + (h kw -. 8mm 3. Referencing Figure 1, the keyway dimension is W x T 1. Calculate the values required to cut keyseats and keyways with this online tool. Keyways Index. Standard Metric Keys & Keyways for Metric Bores with One Key • Couplings (Page 2 of 2) All Types 427-140 Reo a 21 (P eso) oola e el 11 pesees 2 Telepoe 22 a 22 eoo Key & Keyway Dimensions – Millimeters Coupling Hub Keyway Dimensions – Inches Shaft Diameter “D” Key Size Nominal Keyway Width Hub “W” Keyway Depth Hub “T2” We also cut keyways in blind hole conditions, including blind keyways with a groove relief at the end of the keyway (most common and preferred process) and by exiting out of the keyway with a radius. Keyway metric dimensions key iso tolerance js9 r773 width per depth hub t2 height radius text mill question answered hasnSolved 5. 0 for severe vibrations/shocks. Shaft diameter d k: Local diameter at the critical area (grooved section). The grouted keyway creates a water barrier, which can be designed to resist relative deflection of the precast units under (PC) applied loads, as discussed in Section 5. 5∘. 1 Square Keyway Tolerances Minimum 2. 3mm 2. 5000 2. - Series EL couplings supplied withTo use the calculator, enter the module and number of teeth and the rest of the table should automatically update. Whereas the P9 tolerance is a press fit tolerance. For the calculation, the elastic moduli E1, E2 and Poisson's ratios ν1, ν2 of the contacting bodies should be specified. Keyway Depth. Depth (Y) =. Milling operations remove material by feeding a workpiece into a rotating cutting tool with sharp teeth, such as an end mill or face mill. P. Standard External Metric Thread and Fastener Sizes M 0. It's not like keyways are particularly hard to figure out, like the math isn. Status: Withdrawn. Chain Length Calculation Speed Ratios Sprocket Diameters Horsepower Ratings Sprockets American sprocket manufacturers have adopted 4 specific types of sprocket construction styles as American Standards . The key length should be less than 1. 3- Special case for M6 from 250mm to 315mm tolerance. . Tolerance zones for external dimensions5″ + 3″ = 8″. See Page 2 for Optional P9 & D10 Keyway Dimensions H WKeys and Keyways: Dimension charts for Keys and Keyways: Limits, fits and tolerances calculators: Calculates the limits, fits and tolerances according to ISO 286(2010), ANSI B4. Calculator for designing shaft keys Shaft diameter d mm Shaft torque T Nm Key length L mm key width b mm key height h mm keyway depth shaft t 1 mm keyway depth hub t 2. h. Machine Design and Engineering. Torque Capacity of Shaft T = π D 3 τ / 16. Free engineering tool to calculate the bending moment and shear force diagrams of a multi-diameter shaft. Need a price instantly? Contact us now. Standard size of b1 and b2. 2. 1265 0. Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque. For a key to function, there must be a keyway on the shaft and a keyseat on the rotating machine element. Referencing Figure 1, the keyway dimension is W x T1. Determine the spindle speed (RPM) and feed rate (IPM) for a milling operation, as well as the cut time for a given cut length. * These Width A values were set with the maximum keyseat (shaft) width as that figure which will receive a key with the greatest amount of looseness consistent with assuring the key's sticking in the keyseat (shaft). (916) 408-2442. Keys and keyways secure the hub and shaft to prevent relative movement between a power transmitting shaft and an attached component. It helps engineers and designers determine the width and depth of keyways needed for specific applications. Keyway definition: . com web: Supersedes 4-96SFM calculator for drilling, milling, & turning over 170 materials 19. Hub keyseat has been sometimes referred to as a keyway. P. 25 - M 1. It will figure out the. 5020. There are now a width and height values width their corresponding tolerances. Metric key keyway dimensions per iso/r773. The hollow core slab keyway geometry on my project has a very small "indented section" which would allow for a calculation similar to a typical 2x4 keyway + dowel calculation in conventional concrete design. 5. The surface is in contact with a liquid or gaseous medium. Hole tolerance for diameters not defined by ISO 286-2. feed per stroke of 0. Key keyways keyway dimensions corresponding their shaft keys parallel technical shape motion controlDesigning of shafts: – designerscad Key and keyway dimensions (control in motion)Keyway chart. Simply nail or staple KEYWAY to the form or header prior to pouring the concrete. 13. (b) It can not be used as a feather. Mark the string where they overlap, then measure its length. Export G-code for internal & external chamfers, tapers, & radii with tool nose comp. Nearly every shaft diameter has a corresponding standard keyway width and depth – this calculator helps you find it. CNC keyway calculator 23. Shaft Keyway Shear and Yield Strength Formulae and Calculator. These values are to be reduced by 25% if the shafts have keyways. Product description. App calculates cut time based on keyway depth, length, & depth of cut. Regardless of which unit of length you're using, you'll need to measure the following: width, height, and length. - Calculate the dimension for measurement of the keyseats. having a width equal to the width of the key. When the re-steel is insufficient to resist shearing pressures through the plane of the key, keyways are utilized. For the calculation, the number of splines n should be specified. To use this online calculator for Shear Stress in Kennedy Key, enter Transmitted Torque by Kennedy Key (Mt k), Diameter of Shaft using Key (d s), Width of Key (b k) & Length of Key (l) and hit the calculate button. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. 8mm 1. 11. The usual proportions of this key are : Width of key, w = d / 4 ; and thickness of key, t = 2. AGMA ASA Keyway and Bores Design Data including dimension and tolerances. 4 3 3 11 12 4 1. In this calculation, the stresses σ and deformations ΔD of the pipeline with a diameter D, wall thickness t and pressure P are determined. Non standard bores and over the keyways. 4 Utrymmesbehov vid fastsittande kilThe second is a P9 tolerance. of Teeth and the Chip Load per Tooth to Determine the Feed Rate (In. The maximum shear stress occurs at the outer radius of the coupling and at the interface of the two bores. Torque is measured in degrees is calculated using Torque Exerted on Shaft = Force * Shaft Diameter /2. 350 Maximum 2. ) Withdrawn Application number CN 88204457 Other languages Chinese (zh) Inventor 左建中 陈玲珑(a) The depth of the keyway weakens the shaft. Enter the size of the key and shaft, and get the depths, overall measurements, and chord height for shaft and bore. 3 12 8 45 50 14 3. Tolerance of shaft. DIN 6885-1 :- Key, Hub Keyway, Shaft Keyway Details and Dimensions DIN 6885/1 :- Definition Drive Type Fastenings without Taper Action; Parallel Keys, Keyways, Deep PatternMetric thread, Screw joint calculator. Read more on how keys and keyways work and what types are available – Keys and Keyways. Following the calculations, the. The height of inch keys decreases by 1/8" for every 12" of length. 5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion. 4 chambers for change keys (5x5x5x5=625) 2 chambers for MKs (5x5=25) and repeat on 2nd and part of 3rd keyways. Keyway size. Calculate the keyway dimensions for imperial keys using this online tool. 0 2 2 9 10 3 1. Woodruff key imperial eBay. Imperial Woodruff Key Keyway Dimensions Ebook PDF Elschools. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. The shaft is assembled from single sections (cylinder, cone and polygon) including features (chamfers, fillets, neck-downs, and more). MoI Calculator. Optional taper bushes simplify installation and removal. Custom macro. The key length should be less than about 1. Thread Calculators 6. The video helps you to understand how to do taper shaft calc. For a shaft key to function properly, both the shaft and rotating elements ( gear, pulley, and coupling) must have a keyway and a keyseat. Keyway Stresses for Non-metallic (phenolic laminated materials ) Gears Formulas and Calculator Power Screw Design Equations and Calculator Gear Ratio Equations and Calculators of Planetary or Epicyclic Gear Assemblies Gear. Metric – Rectangular B. Standard. Machine keyway to recommended size and tolerance listed per Table 4 on Page 3. Fmax = 1890 [kg] Now we can proceed to the final step, which involves calculating the force necessary when the grinding operation begins. Use the Shaft Component Generator to design the shape of a shaft, add and calculate loads and supports, and other calculation parameters. t1. Calculate the shear stress and crushing stress of a keyway connection with a prismatic key of a length L, height H and width b on a shaft of diameter D in a keyway of depth t. Nominal Dia. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. These Woodruff keys are mostly used in machines, tools & automobile shafts ” to 2½” (6 mm to 60 mm) in diameter. As a general rule, the key is a tighter fit to the shaft so that the key remains on the shaft during assembly and removal. 6. When a keyway is damaged, cut a new, wider one. 5. Select a Preset. This is why we allow the book. 14 into a calculator gets you 3. Hardware ANSI Menu. Different forms of shear key at the joint between footing and basement wall are shown in Fig-3. The shaft is under torque T, applied to the end. 3125 0. Rectangular sunk key. Stress Concentration Factors in Design calculators give you a List of Stress Concentration Factors in Design Calculators. 26, so the flat diameter is about 3 1/4”. When a keyway is damaged, cut a new, wider one. However, the fillet radius of the key seatSymmetry, which regulates the symmetry against the datum, is measured using a caliper, micrometer, or a coordinate measuring machine. Countdown to Any Date – Create your own countdown. You need about 33 cm³ of grout for a tile with length 12 cm and width 24 if your total surface area is 290 cm², with the border gap 1 cm around the tile. Select your units as required. (2001) covers all the standard keyway and drilled sources of stress concentration. Welcome to mechanicalcheck. Shaft tolerance for diameters not defined by ISO 286-2. Definitions, online calculator and figures and tables with water properties like density, specific weight and thermal expansion coefficient of liquid water at temperatures ranging 0 to 360°C (32 to 680°F). 30 ft high RC R/W with berm height of 22’-0”. F = Force. Get it here. - The maximum tolerance describes the. 1) stress by torsion is relaxed after tightening. 018 * 0. Find the depths to cut in keyway and keyseat. 1265 0. 8mm 2. 014 or . keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keysWhy BEST. Angle of Twist under applied Torque Moment. CNC Machinist Calculator Pro is great for CNC programmers or machine operators who need to make quick calculations on the fly. Sprockets come in a wide range of tooth counts for each ANSI chain size. British ISO Metric Screw Threads Designations. Keyway Stresses for Non-metallic (phenolic laminated materials ) Gears Formulas and Calculator. Manufactured according to ISO606 & ASME B29. 1), C e is the ratio of the endurance limit with the ultimate tensile stress as listed in Table 3. 0 for "smooth" loads with no torsional vibration nor shock, up to about 3. Size, grade and types of bolts required 4. 4 18 11 66 75 20 4. From the right side of the shaft total diameter is given with tolerances. Torque Applied Deformation and Stress of a Shaft with Keyway Equations and Calculator. For the calculation, the elastic modulus E and Poisson's ratio ν of the pipe should be specified. Within this length the keyway shall have full depth. 8mm 2. We also have an Imperial Keyway Calculator. WIDTH. M. & Rob. Deadbolt operated by key outside and thumb turn inside. The calculation is designed for geometric designs and strength checks of shaped couplings of shafts with hubs. 001 larger than the previously measured across-point dimension. Keyseat Alignment Tolerances: A tolerance of 0. Includes round deadbolt strike. Keyway Bore Diameter Size Bore Reference -0. Width of Key in Round Shaft - (Measured in Meter) - Width of Key in Round Shaft is defined as the width of the key that is fixed in between the shaft and the hub to prevent. Various Geometric calculators 22. Try our Keyway Depth Calculator. Shaft keyway depth calculator. Cut it. It was not until I put it in there that I realized that I needed a keyway (the red circle on the blue pulley) This made for a challenge, since the sanding drum is 25 lbs + and its three feet long. Male Keyway Broaching:. CNC keyway calculator 23. Select your units as required. 414 Maximum 2. The key and key seat cross section are ISO standardized. 32 mm working stroke. Calendar Generator – Create a calendar for any year. This feature was added by the request of These calculations may vary depending on the speed of your. The key length should be less than about 1. L Type Inch Bore / Keyway The L Type coupling consists of two standard L Type hubs and one spider. 5^\circ θ = 80. +1 (800) 394-3279. nironental Connectors F-4 AR C • AR A • DA CA -4 • -4- • FA --© 2009 Glenair, Inc. Information. The algorithm of the program takes into account a loose connection in the case of insufficient tightening torque. 9 20 12 76 86. ANSI woodruff size charts express measurements in inches and nominal key sizes with higher numbers corresponding to bigger keys. When you use our service you can be assured the latest editions and easy access. 5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in. Properly jointed pavement Spacing of the initial cracks varies from about 40 to 150 ft (12. Enter your. CNC Machinist Calculator Pro is a machining calculator designed for manufacturing engineers, machinists, CNC operators, tool & die makers, and at home hobbyists. D o 3) =41,5 MPa (F of Safety (S s / τ) of about 4,8) Key Calculation. Diameter of Shaft: The diameter of the shaft that fits into the hub. 5020 2. The key length should be less than about 1. L e The effective length of the key = 70-2*4 = 62mm = x (calculated above = 2,94mm, x 1. Find the depths to cut in keyway and keyseat. 000. 8 14 9 51 58 16 4. Company Press Contact Us Careers. Calculate another keyway : 2388 State Route 726 Eaton, Ohio 45320 (937) 456-2232 Fax (937) 456-2282. 1 Nm. With our tool, you need to enter the respective value for Force & Shaft Diameter and hit the. At the shop I work at, we've started making all kinds of keyways and I haven't found an app that does everything I'd like which are: - Calculate the dimension for programming the depth of the keyseats. Slide Fit Key / Key slot. You can measure the taper bore of a propeller with digital vernier calipers. ). 8. 3mm 5mm 5mm 5mm 5mm 6mm 6mm 6mm 8mm 8mm 22mm 24mm 16mm 17mm 19mm 20mm 25mm Keyway Width (w) 10mm 3mm 3mm 1. 11 Notch factor - use calculator above; use charts for von Mises stresses. Metric key keyway dimensions per iso/r773. Power Requirements. (Ver. Cut it. Keys are inserted inside the shaft and hub keyway to ensure the working of the complete system. Moorland Rd. Wind Load Calculator. They have no effect on the moment capacity of the wall joint. Refer to pages JW-11, JW-12, and JW-10. 5. This page explains the advantages and disadvantages of using these instruments. DIN 6885-3 :- Key, Hub Keyway, Shaft Keyway Details and Dimensions DIN 6885/3 :- Definition Drive Type Fastenings without Taper Action; Parallel Keys, Shallow Pattern, Dimensions and ApplicationHey guys. We started With a very low strength, and can afford to increase itThis episode on Blondihacks, I’m showing three ways to cut key ways! Exclusive videos, drawings, models & plans available on Patreon!calculator has been tested, but no guarantee can be given for the accuracy of the results. Fender Accessories (Panels, Chains, Brackets) Catalogue en V1. 3) Keyway fillet radius to be specified by customer. Order Now American Fluorescent MCM432R8 Mission Style Wood Frame 4-32 Watt T8, Maple Finish with White Configuration:Wide Rectangle, Finish:Maple, Diffuser:White Acrylic, Ballast:Residential Electronic, Light Bulb:(4)32w T8 Med Bi-Pin Linear Fluor Contemporary Wood Mission Style Fluorescent Flush Mount Fixture. As a result of calculations, the total twist angle φ and the maximum shear stress τ are determined. Shaft tolerance for diameters not defined by ISO 286-2. 3 16 10 59 65 18 4. Install in a keyway to transmit torque from shafts to gears and other components. 1) stress by torsion is relaxed after tightening. Keyway Depth = <%=d %>. Feed Rate. Buy this standard Standard Swedish standard · SMS 2305 Keyways for rectangular or square parallel keys. These practices will help you gain the maximum benefit from your precision shaft alignment by minimizing imbalance at the coupling. by 20 to 40% : Surface Speed Ft. This calculator allows for the calculation of shaft work and the optimal sizing of a rotating shaft under a torque load. Settings to customize the number of decimal places to display. All internal calculations are done using metric millimeters. Following the calculations, the total twist angle φ and the maximum shear stresses τ in the section are determined. CNC Machinist Calculator Pro is a machining calculator designed to make your life easier. Export G-code for internal & external chamfers, tapers. The Date Calculator adds or subtracts days, weeks, months and years from a given date. 3 10 8 39 44 12 3. 5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion. Face Width - Face width is limited in its maximum dimension to allow proper clearance to provide for chain. Beam Calculator. See examples of KEYWAY used in a sentence. The value of the stress concentration factor is calculated by: Budynas-Nisbett, "Shigley's Mechanical Engineering Design," 8th Ed. 000 Standard Setscrew Locations If one setscrew is furnished the location. This free online tool helps you determine the depth of a keyway based on its width and length. Shaft tolerance for diameters not defined by ISO 286-2. 4mm 8mm 2mm 9mm 12mm 11mm 4mm 4mm 14mm 15mm DIN 7154, H7 Metric Bore and DIN 6885, Js9 Square Keyway Tolerances Page 1 of 4 KEYWAY is a lightweight, flexible, tongue and groove joint made from PVC. b2 tolerance （E9）. Depth (Y) =. Excel is easily able to do mathematical equations in milliseconds. Shaft Calculator. The value of the stress concentration factor is calculated by: Budynas-Nisbett, "Shigley's Mechanical Engineering Design," 8th Ed. ©2023 Acoem USA. From the bottom of the bore to the top of the keyway (X) is. This stress can be derived from the torsion formula: τ max = T D o / 2 J. 5. Square Drives for Socket Tools ASA B5. The strength in torsion, of shafts made of ductile materials are usually calculated on the basis of the maximum shear theory. 045*0. Keyway chartStandard keyway dimensions Keyway calculator shaft depthKeyway-and-key-size. This calculator considers maximum permissible shear stresses as 8,000 psi for shafts with allowance for keyways and 6,000 psi without keyway allowance. P. Assorted Imperial Woodruff Keys Spalding Fasteners. Torque Applied Deformation and Stress of a Shaft with Keyway Section Calculator. CNC keyway calculator 23. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86 interference fit bores without set screws commercial standards. Material Removal Rate. Woodruff keys. The projecting part of Woodruff key fits in the keyway in the hub. As a result of calculations, shear stress τ and crushing stress σcr in the splines are determined. The shear key is cast as part of the wall extending into the keyway or groove formed in the footing. Shaft Calculator. b. The key is then tightly fitted between the keyway and the keyseat, hence the mechanism is called a keyed joint. Metric External Table Chart Thread Designations Sizes M 1. 5020 2. Read reviews, compare customer ratings, see screenshots and learn more about CNC Machinist Calculator Pro. Cutting Time. 3) Keyway fillet radius to be specified by customer. /Min. be made for keyway and setscrews. 1 August 15, 2007 1 17. Download. Machine keyway to recommended size and tolerance listed per Table 4 on Page 3. EDIT 1: I did the calculations with some numbers using the usual simple formula and NMech's approach and I got different results ($\approx$ one order of magnitude). Keyways Index. by Crystal Bemis on August 1, 2022. • Campo de atuação: Engenharia Mecânica, Engenharia de Produção. It includes the following features: 1. ; Government Find flexible and secure access control solutions through your preferred procurement channel. CNC Machinist Calculator Pro is great for CNC programmers or machine operators who need to make quick calculations on the fly. Estimate the taper length for the workpiece having major and minor diameters as 12 and 6 inches, respectively. Check how the old prop fits the taper shaft and the amount of draw - i. τ = 16. CNC Machinist Calculator Pro is great for CNC programmers or machine operators who need to make quick calculations on the fly. 1875 0. The shaft fractured in the keyway. Keyway Bore Diameter Size Bore Reference -0. RoHS. Special products made from grey cast iron HT250 or cast iron 250. -ail: salesglenaircoRe: what should be the length of key way for 155 dia shaft. 5" (63. Enter the key width, height, length, keyway. Retaining Wall Calculator. The stress concentrations at the keyway end are most severe for the profile keyway, so with respect to fatigue the sled-runner is the best design. Fits and tolerance calculator for shaft and hole tolerance calculation according to ISO 286-1 and ANSI B4. 33. System 70 uses depth increments of . Use the Shaft Component Generator to design the shape of a shaft, add and calculate loads and supports, and other calculation parameters. While a designer is free to specify any keyway they wish, straying from the standard option is likely to increase the cost, time, and complexity of the part. This feature was added by the. S = ( 33,000 · HP ) / ( V · A ) SI Units. Keyway size. Select the Material. 3mm 2. CNC Machinist Calculator Pro is great for CNC programmers or machine operators who need to make quick calculations on the fly.