Harmonic drive 4th axis build

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22 Oct 2018 20:51 #119221 by Hakan
I am getting in to building a fourth axis using a harmonic drive gear unit.
I will document this project in a series of youtube videos.
I kind of likes the video format, it helps me keep up the interest during long builds like this one.
Remember that I am just a hobbyist trying to make things.
Feel free to have a look

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23 Oct 2018 15:42 #119268 by andypugh
Do you want one of these castings?

bodgesoc.blogspot.com/2017/05/harmonic.html

I think I have one left.

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23 Oct 2018 19:46 #119277 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
I see we have more interests in common than only harmonic drives. Nice build there. I am happy you find the harmonic gear works well for a 4th axis. I share the view of hefty price. I bought one from Korea I think. There is at least one seller selling many different sizes and versions. I ended up paying around 500 USD including (fast) shipping and VAT. I don't see that my harmonic drive will fit in the housing. Things would have been different if I had found your page while googling earlier.

Do you happen to have a video showing it in action?

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23 Oct 2018 20:00 #119279 by andypugh

Hakan wrote: I don't see that my harmonic drive will fit in the housing. Things would have been different if I had found your page while googling earlier.


It is very convenient that mine has the servo built-in, it makes for a much simpler build.
You might want to consider belt-drive for yours, to maintain the potentially-useful through-hole.

Here is mine in action:

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23 Oct 2018 21:06 #119287 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
Agree, I looked for it, but there was only a (too) small one with servo motor showing up while I was searching. They also tend to cost more, so yours was a real bargain. I feel I can spend 60 USD on telephone charges to find a foundry that will even accept such a job here. Not to mention their charges.

I enjoyed your video. Always nice to see some cutting, some out of the ordinary, plus some problem solving along the way. The whole idea of a 24k spindle... I can see myself doing that. And the harmonic drive performed flawlessly as far as I can tell even if it was only part of an engraving job.

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23 Oct 2018 21:59 #119295 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
The next part is made

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24 Oct 2018 11:14 #119327 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
Manufacturing of the front plate. The harmonic drive is screwed tight to this plate.

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28 Oct 2018 10:31 - 01 Nov 2018 19:00 #119544 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
Milling and drilling of the rest of the plates. There are many many holes...

Last edit: 01 Nov 2018 19:00 by Hakan.

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01 Nov 2018 19:02 #119778 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
Drilling and tapping. Going ahead too fast so have to rework some parts.

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04 Nov 2018 15:55 - 04 Nov 2018 20:56 #119932 by Hakan
Replied by Hakan on topic Harmonic drive 4th axis build
Working on the chuck plate.

Last edit: 04 Nov 2018 20:56 by Hakan.

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