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Tool Post Grinder

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Joachim Steinke:
Hallo Stew,

this is my very first post here and I’m absolutely not used to publish in English, so have a little mercy with my grammar, its rusty. So I will try to use more pictures and reduce my statements…..ha ha ha…..

Some years ago I began experimenting with sewing machine motors for the same purpose than you, it was really not very satisfying. Cheap okay, but a lot of noise and vibrations too (poor bearings), and the little types up to 90 Watt are too weak for the most of that jobs on the lathe, particular for outer grinding operations with wheels obove 1” diameter.

So, if it has to be a little bit nice, really low vibrating, very compact and silent too what’s about using that type of servo motor:





This is a Nanotec DB42 Brushless DC Servo, 48 V, 150 VA, 6000 rpm, and it makes enough power for using 2” to 3” grinding wheels without problems. The only crux is the need of some special servo motor amplifier and a DC power supply. I use the Maxon DEC 50/5 amplifier and a switching power supply 50 V, 6.8 A.





Normally I use the spindle on my Mini_Bonelle tool and cutter grinder…..





but it always does a good job on the lathe too…..





Otherwise, for the limited purpose of internal grinding with small tools this little spindle with an Escap 36 V, 70 VA DC motor is really sufficient.








The system is very compact and can be convenient used on even small machines in the class of 13” between centers. Every normal DC power supply with a max. out put of 36 V and 2 A is sufficient to run this high precision motor.





Bye, Achim from Germany

P.S. more details can by seen on my web site http://www.metallmodellbau.de , sorry, but only German language there


P.P.S.  oops...got some problems with linking the pictures??

P.P.P.S...problems with pictures are solveld...ha ha ha

bogstandard:
Stew,

Just been taxing my brain (whats left of it).

I am sure the brown stuff workers will know something about routers.

I bought one once, crippled some brown stuff with it, then duly gave it away.

What I am getting round to is that it had a very compact but super fast powerful motor on it.

It was only a cheapo Black & decker, but the motor was a self contained lift out unit in it's own case, not much larger than the sewing machine one you have already tried.

My neighbour picks them up from the Wednesday morning market car boot sale almost every other week for a couple of squid apiece.


John

raynerd:
Joachim Steinke  - your English is excellent, don`t worry about that. Just been on your website with a translator and your work is absolutely amazing! I`m new to this hobby but I think your designs, pictures and finished products are some of the best I have seen....

sbwhart:
Hi Achim

Thank you for showing your grinder and pointing me in the right direction in regards to motor selection.

Had a look through your site, you have made some wonderful bits of machinery  :clap: :clap: :clap:

First class workmanship.  :clap: :clap: :clap:

I'm going to go back to your site and have a closer look at some of the things you've done.

Thanks you for showing

Cheers
 :beer:

Stew

John Hill:
Joachim Steinke, welcome to our group and please do not be concerned at your skills in English.   I presume you learned your English through careful study at school or university  whereas I learned mine from the wife of a shepherd in the mountains of New Zealand and even now 60 years later I would still be like a helpless baby if I tried to speak your language.

I really admire your work and your photography too!

John Bogstandard,  I have a rather nice 1/2hp router (superceded by a bigger one) which is getting measured up for the toolpost.  The router name plate states 27K RPM and I am wondering what spindle speeds I should be allowing for in my design?

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