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Tool post grinder build Clough42 inspired

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PekkaNF:
Looking good. And the hole is on the wrong side :doh: No wonder it was nearly too deep for the hole saw I checked. I was sooo concentrated squares and centering it that I made it to long side. That will complicate fitting and spindle clampping.  Decided to trundle on.

Boring it was simple, but I needed to chop one 12 mm boring bar for it.

Pekka

PekkaNF:
Andrew paints few square meters on one go, I paint one small part...

Went pretty fast, because I had powder paint drying owen to chuck the part to dry.

I washed the part carefully, used hot air gun to blow it dry and then chucked it into owen at 100 degrees for half an hour.

Then two coats of filler (that works also as a base paint), light sanding after first coat (and light one after second coat, because I got few water droplets into paint - it was a heavy fog outside and I was painting it at garage doorway).

Then one thick fill of one part two componenet water carrier epoxy. Let's see how it works.

krv3000:
hi brill work

PekkaNF:
Thanks.

I did mention that I bored the hole on wrong side - that pretty much prevented me of using time honored split "casting" with screw clamping method.

Therefore I decided to put split cotters to use. Decided to drill and ream 12 mm holes symmetrically on both sides of M16 central stud hole and leave enough space to fit screws or other mounting hardware for OD grinding wheel guard.

The split cotters are made out of aluminium not to mar the spindle. I though of fancy circular cut like this:


This sorts of thing:
https://burdickjp.gitlab.io/2019/11/14/splitCollets01.html

But I find working with them fiddly if you need to remove the spindle - and on this design you may want to when swiching over radial/axial drilling/grinding on some ocasions. Therefore i first went on simple 45 degree bevel on both ends of the locking pins. Found out on first try that geometry is such that when tightened it will leave a small dent on this bevel. Not really a problem, but chucked the pins on lathe and turned the bevel to maybe 30 degree to give more contact area.

If bevel deformation ever comes a real problem I could make new pins put of harder Aluminium grade or use some sort of brass or bronce....

Next step is to make a spacer to adjust the grinding spindle axis to same level as lathe spindle axis. Originally I had a plan of making an adjustable pilar that would be coaxial to tool post mount screw, but boring this block on wrong intialy ate up all the space for this one too.....back to drawing board: Solid spacer "thick washer" it will be. I better measure it three times and cut only once.....

I could allready test drive it, but I don't want it to jump all over....(once happened to one servo motor - parameters were wrong and it was shaking violently - almost run off the table in split second).

PekkaNF:
Test assembly and power test went fine. Slight vibration at top rpm is belt is too loose.

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