Gear cutting with a shaper?

Micheal,

It is the pitch circle disc 'C' that is the critical item, not the diameter of wheel D in that design. I had managed to slightly misinterpret the sketch on the first page & was thinking that index latch 'L' was attached to the fixed body of the shaper. It would require fewer parts, less machining and... index wheels 'D' cut to the correct diameter but not risk the possibility of a wire being compressed and not rotating the wheel during any backlash movement of the shaper traverse.

I can now understand why you were so concerned and apologise for any confusion caused.

It is, however, a mighty clever way of machining gears.

Regards,

Richard.

John Stevenson's link to a Maag patent was very useful ... Although it relates to a later development, it does mention the use of steel bands [as 'prior art'] and it cites this 1934 patent. **LINK**

https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=403886A&KC=A&FT=D&ND=3&date=19340104&DB=EPODOC&locale=en_EP

... Which shows positive location of the bands, rather than reliance upon [for want of a better term] a 'capstan wrap'.

I think this design-detail might be worth incorporating in the Shaper attachment.

MichaelG.

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Richard,

Thanks for the clarification [no apology needed]

We're all 'on the the same page' now

.... and that's what really matters

MichaelG.

Yes, I think this would be a better drive arrangement Michael - it would certainly avoid any risk of slippage/movement through the simple 'friction' drive. I did wonder about how adjustable it would be to various diameters of PCD 'roller' but the required adjustment to the band lengths could obviously be via a modified Item '5' in the drawing given (currently shown as simple band 'end' retainers). Each PCD roller would just need two additional tapped holes in them... so not that much extra work & not hard to do.

I also think I'd implement this on the 7B (rather than the Adept No 2) though...lot's of repetition passes I suspect

Regards,

IanT

Sorry, that was thought to be so obvious that it didn't need mentioning .

.

Just when I thought this thread was actually getting somewhere !!

It wasn't clear [to my old eyes at least] from your video how your bands were fixed.

... and your statement was, perhaps, just a little cryptic:

[quote] I used 2 thou shim stock instead of the wire in the link. Other than that, the setup was very similar. [/quote]

MichaelG.

Edited By Michael Gilligan on 14/02/2017 21:40:22