Motor shaft machining advices welcome.

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ThierryGTLTS
Posts: 55
Joined: 09 Aug 2017, 11:10

Motor shaft machining advices welcome.

Postby ThierryGTLTS » 14 Nov 2017, 16:38

Can you give me some advices as I have to shorten and reduce the shaft diameter of a motor.

It seems that the material used is extremely hard.

Of course I've seen videos that shows to use a plastic bag with tape to prevent iron fillings to be attracted by the magnets.

But what tool to use and how to have a very clean and well done work?!

The shaft is 10mm dia and i have to reduce it to 8mm as precisely as possible.

Original shaft is 10mm +0 -0.007mm!!!

Concentricity is also a concern, and I cannot remove the shaft which is pressfitted.

Have a Nice Day.

Thierry

slapshot136
Posts: 27
Joined: 15 Sep 2016, 18:24

Re: Motor shaft machining advices welcome.

Postby slapshot136 » 14 Nov 2017, 19:53

Preferably on a lathe to keep it concentric, and then use a carbide cutting bit (preferably full carbide, not just coated) to deal with the hardened material - make sure you have a stream of coolant to prevent it from heating up & destroying anything

ThierryGTLTS
Posts: 55
Joined: 09 Aug 2017, 11:10

Re: Motor shaft machining advices welcome.

Postby ThierryGTLTS » 15 Nov 2017, 08:02

Thank you for your answer.

I've just noticed that there are also ceramic cutting tools.

But I don't know where to buy at an acceptable price, any idea :?: :!:

Have a Nice Day.

Thierry

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TheFallen
Posts: 50
Joined: 26 Oct 2016, 10:49
Location: UK
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Re: Motor shaft machining advices welcome.

Postby TheFallen » 15 Nov 2017, 08:48

Carbide would be enough. Ceramic is completely unnecessary.

slapshot136
Posts: 27
Joined: 15 Sep 2016, 18:24

Re: Motor shaft machining advices welcome.

Postby slapshot136 » 21 Nov 2017, 03:50

ThierryGTLTS wrote:But I don't know where to buy at an acceptable price, any idea :?: :!:


Honestly if your only going to do this one, it would be cheaper to get a machine shop to do it, especially if you are unfamiliar with the bits, as the harder the bit in general the more brittle it is, and you are highly likely to damage it (i.e. have it chip) - and then you would need to re-sharpen/etc.

I doubt you will find much as far as a "deal", because these are generally expensive pieces that get worn down, re-sharpened, used up completely & replaced, there isn't really much of a "DIY" community around them, but do check out any local machine shops anyways & see if you could buy something that's almost used up, or perhaps a liquidation type of sale (i.e. TechShop)

ThierryGTLTS
Posts: 55
Joined: 09 Aug 2017, 11:10

Re: Motor shaft machining advices welcome.

Postby ThierryGTLTS » 21 Nov 2017, 09:49

Thanks for your answer.

I have succeeded in machining the shaft.

The axle was only hard in surface, so it was not to difficult with my insert Proxxon and Glanze tools.

Have a Nice Day.

Thierry


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