Gallery, Projects and General > How do I??

Cutting internal gear teeth

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bogstandard:
John S,

Mine does have the sliding head, but no machined area at the  back to bolt things to. I think it is designed more for the machine to be used like a radial arm rather than a two headed machine. Besides, even if it would fit, the way the machine is sited, I don't think there is enough room to swing the head around by 180 degs. I have enough trouble swinging the cat.

John H,

Being able to use Sally would be great, but the cost of air fair is a bit offputting.

I have yet to make the slotting tool, but I already have the designs for it in my head. Normally it would be used on the lathe, but to do this job, it would need to be able to work on the mill, so as usual, with my interchangeable tooling idea, I will need to mount the lathe compound slide and toolpost onto the mill, to give me the adjustment for cutting when the part is mounted into the dividing head.

I suppose I could use the mill's own quill as a slotting head, but I don't fancy the idea of loading the quill like that, plus I would have to fix up some method of stopping the spindle turning, and it might be very tight on throat dimensions as well. So that idea hasn't even been considered past the thought stage.

As one problem is solved, another one rears it's ugly head. But what would life be like without it's little problems.

John

John Hill:
John,  yes air fares can be a challenge at times. Living where we are it is a significant air fare to get to anywhere,  three hours is the minimum trip and that only gets one to Australia, its about 13 to the US and I think 25 or more to the UK.  One trip I did to Europe was 46 hours door to door because of diversions due to weather then aircraft problems.

I suppose with some sort of jig you could remove about 75%, maybe more, of the metal by drilling a small hole at the base of the tooth and a bigger drill above it?  Maybe with a dividing head you could drill the teeth without a very complex jig? :coffee:

sorveltaja:
I wonder, what is to be expected. Interest plays main role. Set of planetary gears maybe?

cedge:
John
Have a look at Evan's solution to the hand "hobber/shaper/slotter".  http://metalshopborealis.ca/hobber/hobber.htm

Steve

bogstandard:
Sorveltaja,

There are a lot of engines that use complex internal and spur gear setups. By doing it this way, I will be able to expand the range of engines I have the opportunity to build, purely because the cost of ready made gears is so prohibitive. Being able to make my own will put them within financial reach.

This is a simple example of what I am on about.

http://www.billreichart.com/images/epicyclicengine_lrg.jpg

Steve,

That is almost what I had in mind, but because it would be very dificult to set up indexing on my lathe to do all combinations of internal gears, I will be setting up the same sort of operation on the mill using my dividing head to give me the exact tooth spacing, and the compound to put the feed for the cut on.
Many thanks for the link, that will come in handy when I start to build the slotter, it is now in my 'favourites'.


John

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