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Optic-craft Machining

Builder of complete range of precision clock drives, german equatorial mountings and accessories.
Last Update April 12, 2007
Listed Since July 15, 1998
33918 Macomb
Farmington, MI 48335
United States
(248) 476-5893
(248) 919-9867
Web Site
Feedback from our users
Posted by admin, January 26th, 2002
Praise: Machine Shop 102 will tell you that ball-bearing pillow blocks can handle a thrust of about 1/2 of radial specification which is much much more than sufficient in telescope applications.

Thus, for the Model 3 and above, thrust bearings are a complete waste of time.

For super size telescopes, I believe the mount with the four inch axis uses pillow blocks that include a roller bearing along with the ball bearing race. These units can handle thrust loads equal to the radial load rating.

As far as prices go, custom machining is labor and labor costs money. If you are able to setup your own shop and have the time, then by all means get your own Combo/Lathe/Mill and go for it.

Go ahead and use pillow blocks alone; They are just fine.
Posted by wojosg3, January 22nd, 2002
Neutral: All the bearings are pillow block, on all mounts, no thurst bearings used at all. flat plate used for each axis.
Machine Shop 101, 5 credits
For the prices they want, I can buy a Combo Lathe/Mill,
model G4015Z, @ $795.00 at and make my own $595.00 Alt/Az. mount for 150 lbs of scopes.
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