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Quality and Accuracy Standards

Quality and Accuracy Standards // Additive

Standard Tolerances Per Process FDM Poly Jet MJF SLS SLA DMLS
Z Accuracy XY Accuracy Plus Additional Tolerance of -0.0001″ Slice Height +/- 0.2mm (.008″) or .002mm/mm (Whichever is Greater) +/- 0.5mm or 0.5% (Whichever is Greater) +/- 0.3mm or 0.3% (Whichever is Greater) +/- 0.2mm (.008″) or 0.02% (Whichever is Greater) +/- 0.005” for the first inch, plus an additional +/- 0.0035 per inch thereafter
Standard Layer Thickness .25mm (0.010″) .03mm (.001″) .08mm (.003″) .12mm (.005″) .1mm (.004″) 0.020-0.040 µ Stainless, Maraging Steel (MS1) and Inconel, or .030-.060 µ Aluminum and Titanium
XY Accuracy */- .127mm (.005in) or +/- .002 mm/mm (.002 in/in) (Whichever is Greater) +/- 0.2mm (.008″) or .002mm/mm (Whichever is Greater) +/- 0.3 mm (0.012″) on XY or -0.3% (Whichever is Greater) Note: Values Can Increase For Solid Runs With Wall Thickness Over 5mm +/- 0.3 mm (0.012″) or -0.3% (Whichever is Greater) Note: Values Can Increase For Solid Runs With Wall Thickness Over 5mm +/- 0.2mm (Whichever is Greater) +/- 0.005” for the first inch, plus an additional +/- 0.0035 per inch thereafter
XY Resolution Typically 2x Layer Thickness But Highly Variable 600 dpi 1200 dpi Minimum Feature Size 1 mm (.030″) Up TO 4000DPI Note: Spot Location Onlu Minimum Feature of 0.25mm (0.010″)

Quality and Accuracy Standards // CNC Machining

Metal Optimal Quantity Tolerances (+/-) Advantages & Considerations Finish & Appearance
Stainless Steel 1 – 1000 +/- 0.005″ High Strength
High Corrosion Resistance
High Weldability
Standard Machined Finished
Tumbled
Polished
Bead Blasted (sand or glass)
Low Carbon Steel 1 – 1000 +/- 0.005″ Common Steel
High Machinability
High Weldability

Can Be Hardened
Not Corrosion Resistant
Aluminum 1 – 1000 +/- 0.005″ High Strength
Low Weight
High Machinability
Low Cost
Brass 1 – 1000 +/- 0.005″ Corrosion Resistant
Chemical Resistant
High Density
High Strength
Non-Conductive
Plastic Optimal Quantity Tolerances (+/-) Advantages & Considerations Finish & Appearance
HDPE 1 – 100 +/- 0.008″ Medium Impact Strength
Flexible (Shore D70)
FDA Compliant
No Water Absorption
Standard Machined Finish
Tumbled
Flame or Vapor Polished (Acrylic Only)
PC 1 – 100 +/- 0.008″ Medium Tensile
High Impact Strength
Maintains Properties Over Range of Temperatures
High Optical Clarity (Clear)
ABS 1 – 100 +/- 0.008″ Medium Tensile
High Impact Strength
Electrical Insulator
High Machinability
Low Cost
Acrylic 1 – 100 +/- 0.008″ High Tensile Strength
Can Be Polished for High Optical Clarity
Nylon 6/6 1 – 100 +/- 0.008″ High Tensile
Medium Impact Strength
Maintains Properties Over Range of Temperatures
Acetal
(Delrin #)
1 – 100 +/- 0.008″ Medium Tensile
Medium Impact Strength
Holds Machining Tolerances Well
Good Wear & Fatigue Resistance
ULTEM® 1 – 100 +/- 0.008″ High Tensile Strength
High Working Temperature Range (335°F)
Electrical Insulator
High Optical Clarity (Clear)

Quality and Accuracy Standards // Sheet Metal

All Tolerances Based on actual Capability Studies and Standard Material Variations

All Tolerances below apply PRIOR to Finish.

Single hit hole size: +/-.005”

Punched/Laser Feature to Punched /Laser Feature in same Plane: +/-.010”

Punched/Laser Feature to a Single Formed Feature: +/-.015”

Punched/Laser Feature to Punched/Laser Feature over 4 Formed Features: +/-.030”

Formed Feature to Formed Feature: +/-.020”

Formed Features over several Formed Features: +/-.020” PLUS +/-.005” for each additional Formed Feature

Basic Welded parts and components: +/-.030”

Contact Fathom for specific Tolerances related to complex Welded products.

Formed Angles Sharp to 3/32″ Inside Radius: +/- 1 degree

Formed Angles above 3/32″ to 3/16″ Inside Radius: +/- 1 1/2 degree

Formed Angels above 3/16″ to 3/4″ Inside Radius: +/- 2 degree

Formed Angles above 3/4″ Inside Radius: +/- 3 degree

For any Dimensions specified to “Apply after Finish”, Please contact Fathom for guidance on tolerances based on the chosen finish and materials.

Across National
Time Zones

Precision manufacturing
from coast to coast.

HEADQUARTERS //
1050 Walnut Ridge Drive
Hartland, WI 53029
877-328-4668

ARIZONA
444 W. 21st St. Ste. 101
Tempe, AZ 85282
480-966-2300

CALIFORNIA
46758 Lakeview Blvd
Fremont, CA 94538

COLORADO
7770 Washington St.
Denver, CO 80229
303-288-6855

FLORIDA
14000 N.W. 58th Court
Miami Lakes, FL 33014
305-889-3280

ILLINOIS
1207 Adams Drive
McHenry, IL 60051
815-385-7500

1401 Brummel Ave
Elk Grove, IL 60007
847-952-8088

MINNESOTA
13758 Johnson Street NE
Ham Lake, MN 55304
763-755-7575

NEW YORK
1920 Slaterville Rd.
Ithaca, NY 14850
607-277-7070

401 W. Shore Blvd.
Newark, NY 14513
315-331-7680

TEXAS
1513 Sam Bass Rd.
Round Rock, TX 78660
512-255-1477

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