Aluminium CNC build (TEP mill converted) by Craynerd

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raynerd:
John, Phil...many thanks for both your drawings! I think John, you have actually drawn what I want and what I meant to say. Phil, you have drawn exactly what I said....sorry my fault... :doh:

I`ll have another go:

The drawing shows 1/8" rim with "normal" teeth at 1/16" depth to the centre. I have asked for teeth 3/62" to the centre BUT then incorrectly, I said:
--- Quote ---The one deep tooth, at the top of the drawing, would than be 1/8
--- End quote ---
... I`m sorry, that should have read the one deep tooth would then be the standard 1/16" from the original drawing. i.e making all the teeth smaller and so the "deep tooth" becomes the standard depth of the old drawing.

However, I`m fairly sure that is what you have done John...!

I`ll give it a bash later today... not sure how well it`ll work as I`m invetiably going to end up with a rounded corner. This could also be quite critical in its failure as this is where the pawl binds to the tooth to drag it around!

John Stevenson:
OK now we have sorted the sizes out this is the wheel with a 1/16" master tooth.

shout up which DXF you want and I;ll email it.

John S.

philf:
Chris,

I thought it didn't look right - what's 1/16" between friends?

You're going to have 2 problems I think:

The radius you've already mentioned and the fact that, using a tapered engraving cutter, you won't have vertical sides to the teeth.

You could always relieve the teeth something like (drawn for a 1mm dia cutter):

Cheers.

Phil.

John Stevenson:
Neat Idea Phil, gave me an idea.

Edit,

Chris has said he wants to use a 15 degree engraving cutter so i drew the cutter and offset the tip by 30 thou to see how big the diameter is when cutting 30 thou sheet. taking a guess here as Chris has said 'thin sheet'

So alter two teeth, the one on the left to give a rad at the bottom as you would get by profiling and the tooth on the right by pre driling with the cutter, then profiling.
Looks like the pawl will have to me modified from a complete angle to a radiused one to fit in.

Comments ? bricks ? flying custard ? muuuuuuuum yummmmy

John S.

philf:
Hi John,

I don't know if Chris has a 15 degree inclusive cutter or half angle.

Whichever, the wheel will still have non vertical faces which I suppose could be compensated for in the pawl.

Personally, I'd prefer to use a small diameter parallel cutter to do it.

I prefer the look of the radiused bottom rather than the drilled relief on purely aesthetic grounds.

I'm going in the workshop to experiment on the Quorn T&C grinder - I've plenty of broken carbide cutters as blanks.

Alternatively, it's the ideal job for a 4th axis using a 60 dovetail (or fly) cutter.

Phil.

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