Thread: will this 4th axis work
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17-08-2017 #11
Er, no they don't and no it certainly is NOT!
https://en.wikipedia.org/wiki/Harmonic_drive
https://en.wikipedia.org/wiki/Epicyclic_gearing
Both have teeth, that's about it for similarity.Last edited by magicniner; 17-08-2017 at 06:42 PM.
You think that's too expensive? You're not a Model Engineer are you? :D
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17-08-2017 #12Visit Us: www.automationshop.co.uk
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17-08-2017 #13
Harmonic drives are the perfect solution for high gear ratios, high torque, lightweight, and the most important, they have no backlash. Widely used in multi-axis cnc, articulated robots, etc.
There are a lot of them on ebay, SH from Korea, the only ones at an affordable price...
I was surprised that the Chinese claim to have 4th axis with harmonic drive... possibly used ones fitted inside..
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18-08-2017 #14
I have been considering something similar for quite some time now, but can't make up my mind about it. In theory it would be very useful for me, it would save time because it would turn around the work piece automatically, but maybe the work piece would vibrate too much so it would be useless for what I am doing, so I am not sure. Never the less, there are plenty on eBay as well, shipping from Germany most of the ones I found.
Anyway, I am interested in the subject, as well as the use of it and the experience people have.
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Has anyone bought one of these harmonic drive index chuck thingies? Are they any good? Is the lack of a through shaft putting you off? Who will Magicniner contradict next? So many questions, life is too short for all these questions.
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18-08-2017 #16
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18-08-2017 #17
I am sure they are pretty good otherwise they would not be sellable.
Yes. That and the fact that it is considerably more expensive.
I found his comments very informative and valuable. I don't know what you see was wrong with his comments or choice of words, but I did not find them contradicting, quite the opposite. I would actually be interested in hearing more about his experience and the modifications he did, as well as how he is using it.
...so why did you ask the last one then? It was pretty rude and unnecessary. His comments were pretty valuable, as opposed to your last question...Last edited by A_Camera; 18-08-2017 at 12:59 PM.
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18-08-2017 #19
magicniner, do you have any photos of the mods you have done to your 4th axis. I would like to see it. from your experience with these, do you thinkit would be ok for 4th axis wood milling as is, or a bit of modding
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18-08-2017 #20
John,
I have an early pic of the "proof of concept" I knocked up with what I had lying around,
I've subsequently re-worked the spacer support with alternate bearings to reinstate the through capacity of the spindle, it does what I need in brass, bronze, aluminium and steel.
I don't think it would have been up to much without the tensioner to remove backlash, without the support the stepper shaft bends if you tension the belt,
Regards,
NickYou think that's too expensive? You're not a Model Engineer are you? :D
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