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Proxxon mf70 spindel/motor coupling?, any good idears?

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martin olesen22/11/2020 12:31:00
10 forum posts


i am going to install a new spindel motor in my little Proxxon mf70 mill, instead of the excisting Proxxon motor, since i think it makes too much noise.

With regards to the coubling between the motor axel and the spindel, are there somebody that has a good idear how that could be made, it is very difficult to get a screwdriver sideways down in the motor housing, and i do not like the plastic/rubber solution Proxxon have done?

Anyone have a smart motor/spindel solution for the Proxxon mf70?



Michael Gilligan22/11/2020 13:07:46
18392 forum posts
877 photos

Hello, Martin

I just found this, which might be useful : **LINK**



Edit: also found this, about CNC, which you may want to comment upon:

Edited By Michael Gilligan on 22/11/2020 13:13:37

Michael Gilligan22/11/2020 18:23:15
18392 forum posts
877 photos

Sorry to hi-jack your thread, but it seems a good place to post this CNC conversion: :

Edited By Michael Gilligan on 22/11/2020 18:26:47

Howard Lewis23/11/2020 16:44:05
5072 forum posts
13 photos

Presumably, it is possible to remove the standard motor and the coupling?

If so, why not make a coupling withe the machine end duplicating the standard coupling, and the motor end machined to suit the new motor.

If the comment about a screwdriver refers to a grubscrew securing the coupling to the machine spindle, Proxxon tightened it, so there must be a way in, somewhere. The problem seems to be finding it!

Could it be that an Allen key is needed rather than a screwdriver? Or maybe it requires a "one off tool".


Michael Gilligan23/11/2020 18:20:51
18392 forum posts
877 photos


Please see Fig.3 here: **LINK**


martin olesen23/11/2020 21:20:36
10 forum posts

Hello All,

Thank you very much for the answers.
I think I will try to do what you suggest Howard, making a coupling where i dublicate the standard coupling.
The thing i that i do not like the Proxxon standard coupling that actually transfer the energy from motor to spindel via some plastic and rubber parts, but i may be forced to use this solution to get up running.
Thanks again for your kind help everybody.

Roger B24/11/2020 09:20:37
163 forum posts
76 photos

There appears to have been at least 3 different designs of coupling used. I found this company when looking to upgrade my MF70 to ER 11 collets. I decided that the price was a bit high and instead I may purchase a plain shank ER11 chuck and machine the top to take the Proxxon coupling.


What is your coupling like? This is mine:

005 drive motor and speed control board.jpg

006 spindle drive coupling.jpg

Dave S27/11/2020 19:20:46
147 forum posts
37 photos

I just respindled mine with a complete high speed spindle.

There are a couple of photos on the last page of this thread:



Edited By Dave S on 27/11/2020 19:22:34

Howard Lewis28/11/2020 18:00:36
5072 forum posts
13 photos

Michael, Your eyes are far better than my old ones!

It looks as if a hybrid coupling to match motor to machine is going to be the method used.

Perhaps the "soft" coupling, if it is not just a low cost method, may be to lower the natural frequency of the system. But, being a cynic, suspect the former, or a ready source of aftermarket spares sales!.


larry phelan 129/11/2020 13:43:58
1053 forum posts
14 photos

Someone mentioned an allen key, which just reminded me of when I had to take my rotary table apart.

No way could I see how to remove the top part from the base, but it turned out that there was a tiny Allen screw holding both together, which could not be reached by a standard Allen key, no room to get the key in place.

The only way was to grind down a key to almost nothing to locate the screw, which could not be seen [maybe you were not supposed to see it, who knows ? ]There may be more stupid ways to do things, but method of holding two simple parts together must be high on the list. The table in question is a HOMGE.

Might be worth looking to see if your job is similar.surprise

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