Building new grinders ?

Kosa_PL

Kosa_PL

Joined
Aug 25, 2013
Messages
1,220
Hey,

Time come and you get to thinking that ONE grinder is a problem...

I was thinking to build 3 vertical grinders and 1 horizontial with platen, small wheel and contact wheel (drive wheel with serrated rubber)

Do anyone maybe have CAD files for this to get some start?
Or tips how to make grinder without vibrations and no belt dancing on platen ?
And separate tool arm mount.

I would buy 3 beaumont KMG grinders + one horizontial with attanchemnt for 72" inch belt, but...
Shipping + Customs + 23% VAT making this a bad idea...

Was thinking about something like this for horizontial...
mVeA80.jpg
 
If you do a quick search there are at least one or two "KMG clone" CAD files out there that are "decent". There's also the EERF plans, and I'm sure any other number of plans out there for what you may want to build. I'm not sure how many other horizontal plans are around, but it seems like I've seen at least one floating out there, or at least enough builds to figure one out.

As for limiting/eliminating vibration: Generally the more mass, the better. Eliminate flex where you can. Make sure everything is tight and anything that rotates is concentric and balanced. Belt wobble will depend on how square and true everything is put together, and how well you align everything.
 
Andrew is right...even with real deal kmg sometimes one has to tweek the alignment of the wheels.
That's the main reason for belt wobble. A quick check is running reverse and see if the belt it's still on track!
Of course the platform more stiff and heavy the better, but you might be surprise how light you could go with the build if the wheels are well in line and the axis are parallel.
 
I was thinking also on 1 grinder with 1200mm serrated wheel for 3" belts :) (75mm)
Would be a good idea for kitchen knives :D ?

But probably gettin 48" serrated wheel will be a problem...
 
So I'm finishing up a grinder build myself...how much belt wobble is acceptable/typical? I've probably got <1mm wobble currently and am wondering if that's normal or is it possible to get no wobble at all?
 
If Beaumont EF-48 cost 1.480 $ then for me this is about:
+ ~340$ of VAT ( 23%)
+ ~44$ Customs
Total: 1864$ + Shipping. >.>
 
Making a KMG clone would be ok ?

How big vibrations and belt woobling have KMG originally ?
 
I don't have a KMG personally, but it seems like a pretty solid design with a decent amount of mass. Personally, I'd ditch the belt and drive shaft idea for a direct drive option. There's actually a recent thread that was started about this with some links on how to do. It's actually a bit more simple than the original design, you just need to make sure you get a c-frame motor.

Again, belt wobble has a lot to do with alignment. Square everything up good, put a decent crown on your drive and idler, and as long as you have a decent belt on there, you should be fine.
 
I have this grinder...

And need to get replaced drive wheel and rollers on platen.
 
Last edited:
Bjansen, I really like the aluminum grinder that you built. I'm talking about the jeweled one. Just beautiful. You should show that photo again for anyone who's interested. Larry Lehman
 
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