d1camero
Aluminum
- Joined
- Sep 16, 2005
- Location
- BC, Canada
I am just finishing up a CNC router and want to square it up. I do have a machinist square, but I am suspect if it is very accurate. How can I test?
thanks
d1
thanks
d1
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I am just finishing up a CNC router and want to square it up. I do have a machinist square, but I am suspect if it is very accurate. How can I test?
thanks
d1
Use this with a tenths-reading dial indicator to check squareness and you'll be pretty close.
Thanks everyone for the great suggestions. I tried a number of the above methods and the machinist square that I thought was good is way off. About .003" over 6". Not good enough for helping to set up my large CNC router.
Starrett might be a nice name, but no accuracy specification bugs me. What do you guys suggest?
BTW I use my machinists square for my other machine work (milling and turning). So having a good quality square will be a bonus.
Making a cylindrical square isn't quite as easy as David describes. Because the spindle of a lathe can pump in and out swashplate-fashion if the thrust bearing is imperfectly perpendicular to the spindle, facing cuts can be slightly out of truth. To avoid this the final facing cut should be done between centers using "dead" centers.
If there is any runout at this stage due to the centers drilled in the end of the cylindrical square not being perfectly concentric with the outside of the cylinder, of course that will create an error.
A cylindrical square is perfectly easy to check in a similar fashion to described by Forrest, but all you need is to rotate the square, it should always give the same reading against the DTI.
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