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Forum: 3D Design
 Topic: Sliding parts - tolerances
Re: Sliding parts - tolerances [message #87999 is a reply to message #87925 ] Thu, 17 April 2014 02:44 UTC
avatar FreeRangeBrain  is currently offline FreeRangeBrain
Messages: 219
Registered: April 2013
Go to my shop
Senior Member
You will be able to make a much closer fit if you print them as separated parts, not "as assembled." I have successfully printed mating threads (substantially larger than your garden variety screw) that fit together with only a few thousandths of an inch clearance. You may need to do a few test items of a size similar to your end product to get the geometry just right, as the process varies in consistency as the parts become thicker, due to what might be called "secondary fusion," as the part cools in the powder bed. For a start, in WSF, allow 0.005 inch PER SIDE over and above the clearance you desire at assembly. Do NOT upload the modelled parts in an assembled state, for with only 0.010 inches of clearance they WILL fuse together.

Creativity - sometimes by the brute force method.
Re: Sliding parts - tolerances [message #88000 is a reply to message #87927 ] Thu, 17 April 2014 02:52 UTC
avatar rhgrafix  is currently offline rhgrafix
Messages: 4
Registered: April 2014
Go to all my models
Junior Member
Thanks for your reply, I guess I should have added that I plan to print them separately then fit them together. I guess I will do a test and if it's too tight, I will sand it or oil it :)
R.L. Hamm