Gallery, Projects and General > How to's
PRECISE OPTICAL LAYOUT FOR CENTER PRICKING
Joules:
I owed a friend some favours and since I have been working with some perspex rod thought this might be a good Thank You gift.
A simple design for the base, 3D printed of course.
As I have an 8mm reamer that pretty much set the size the bore was going to be. Next job was machining and polishing the Perspex rod and then setup for marking.
Since the rod at this position is nuts on 8mm, I just had to zero off the top and -4mm for my centre line. Rotate the Square block collet holder (re-zero as the collets are :( )
Put it together and test the optics.
Tight fit, but it will loosen up with use.
My scribe lines are a bit thick, but a quick polish with Brasso of that end would sharpen them up a little. Next job, find my 8mm silver steel and make the punch.
All the optical surfaces are finished with fine emery paper and oil, cleaned then polished in the lathe with Brasso and paper towel. 5-10 mins work per surface. If you cock up the marking just polish it out and start again.
awemawson:
I bought this rather nicely boxed set at a Model Engineering exhibition years ago and it has served me well over the years. You centre it optically, then holding the base still rotate the upper bit to one of the other detentes holding the punch.
Biggles:
Hi I have been using what looks to be a very similar item from Veritas for woodworking. Veritas Optical Centre Punch. I think it’s gone up a little since I bought mine but Axminster sells them. http://www.axminster.co.uk/veritas-optical-centre-punch-475156 :coffee:
Joules:
Bit of extra polish sharpened up those lines, add some sharpie and wipe off with paper towel leaving black in the scribe lines.
ieezitin:
Joules..
Smashing job mate, this would be a worthwhile project for someone to make.
Anthony.
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