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philf:

--- Quote from: Andrew Wildman on January 04, 2014, 04:33:19 PM ---Thanks. I will recheck my measurements. Mine could well be different anyway. I am hoping that I can use standard parts from hpc gears, with the bores and widths modified. I don't have any change wheels for my dividing head for helical gears, its they look like a pain to make!

--- End quote ---

Andrew,

I think you'll find that the pinion is just a straight spur gear - it is on mine anyway. That's why I was questioning the arrangement of the angled teeth on the rack running with a straight cut gear.

If I can I'll try to get some measurements off the pinion but it is very crudely made.

I measured the pitch of the rack perpendicular to the teeth.

Phil.

Andrew Wildman:
Mine has a 30 deg helix helical meshing with a spur pinion which meshes with the rach,. Both the spur and the helical are shot

philf:

--- Quote from: Andrew Wildman on January 04, 2014, 04:48:45 PM ---Mine has a 30 deg helix helical meshing with a spur pinion which meshes with the rach,. Both the spur and the helical are shot

--- End quote ---
Hi Andrew,

Yours must be quite different to mine. There are three spur gears between the handle and the pinion which mates with the rack. These are 24DP.

Phil.

Andrew Wildman:
Double checked the spur and rack gear def 14dp. I have sent an enquiry into hpc gears. Below is part of the enquirey showing the gear arrangement.

Here is a pic of my lash up dresser with an arceuro trade mounted diamond. I will have to replace the long screw with a grub screw when I get one

Andrew Wildman:
These are some pictures of the finishes I am getting

mild steel and hss (sorry about the rubbish pics!)

generally ok but you can just make ot the slight ripples in the surface.

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