CNC belt grinder

N

Natlek

Joined
Jun 9, 2015
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Reading in the last few months different topics around belt grinder I think that the price of belt grinder /with many different additional tool / is became to high .Did someone considered the possibility to build CNC belt grinder ? Say something like 3D router for wood ? The forces we encounter at the belt grinder while grind blade a not high so no need for extra rigid build of CNC like real CNC miling machine ?? Just idea :)
 
The forces aren't high because we have tactile feedback and adjust what we're doing constantly. An automated grinder can't, so it either needs to be rigid, or it needs to repeat tool paths until spark out.

The one automated knife production cell I've seen used a robot arm and cbn grinding wheel with flood coolant.
 
kuraki said:
The forces aren't high because we have tactile feedback and adjust what we're doing constantly. An automated grinder can't, so it either needs to be rigid, or it needs to repeat tool paths until spark out.

The one automated knife production cell I've seen used a robot arm and cbn grinding wheel with flood coolant.
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How surface grinding attachment work on belt grinder? Look , this is not my idea . I have friend who manufacture 3axis CNC macine for wood working .He say that he can build for me in one weekend small 3 axis router / from same parts he build his big machine / which mind that will be very rigid .On me is to build compact and crazy fast two wheel belt grinder /say 2X42 belt/ to mount in place where spindle goes ? Something like in picture . I don t see any problem to do that ?
PS. picture is from web

hFatsZ1.jpg
 
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kuraki said:
You're right you should totally do this, I think it will work great. There's literally nothing you haven't thought of, it's truly as simple as putting a contact wheel on a CNC router.
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The hard part will be building the machine. Once that's done, it's really just a matter of plugging it in and pressing the "make knife" button. Assuming, of course, you remembered to write "make knife" on the big green power button.
 
kuraki said:
You're right you should totally do this, I think it will work great. There's literally nothing you haven't thought of, it's truly as simple as putting a contact wheel on a CNC router.
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Look , construction is not a problem . My friend /with two workers/ for one week builds a 3 X 2 meters CNC router .The biggest job is a masive metal desk , a stand .After that things go really fast . . .The pieces for the CNC are cut to the lengths that suit it ,so something remains in lenghts for this build :) Writing program also is no problem .BUT I wonder if I miss something. Something I can not see it ? I appreciate your opinion so I ask you are you serious in your post I quote ?
 
One issue with your plan is that a 50-100 pound belt grinder is a lot more load on the axis drive motors than a router spindle. Also the force vector from the spindle is circular, and because of the high speed it cancels itself out. In a belt grinder it is directional and will push the head strongly in one direction.

The only way I could see this working is to use a very beefy grinder arm and a powerful motor running very fast.

My guess is that unless it is a monster size heavy unit it won't work well. In any case, the amount of detail will probably be low.

As Kururi said, go ahead and build one and tell us how it works out.
 
I don't think that we are on same page guys .. ... I don t think on CNC router made from AL profile to attach Dremel 3000 on ? There was many kind of linear rails and bearing with different load capability ..My Friend is in China at the moment so I can t take picture there ...I think on something like on this picture from net ...heavy weight build .We don t need long Z ,X , Y axis for this kind of build , probably 20 X 20 x 10 Inch is enough, so I think that will be more then enough rigid for this job . We will not build this tomorrow , of course . . .maybe in summer .I start this topic to share and discuss about this idea with you .........

1Piu65W.jpg

50-100 pound belt grinder is a lot more load on the axis drive motors than a router spindle
@stacy , for easy on axis drive motor my friend use air cylinder ......
 
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knife to a gunfight said:
The hard part will be building the machine. Once that's done, it's really just a matter of plugging it in and pressing the "make knife" button. Assuming, of course, you remembered to write "make knife" on the big green power button.
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Well ................... :)

 
OK, it took me a while to figure out the grinder setup. I could see the CNC portion. Now I see the CNC is an attachment that fits to the 2X72" grinder. That should work nicely. Please do keep us updated on on your progress.
 
Any machine can be made to make anything. Automation, since the industrial revolution.
 
Once you factor in the time and money building the machine, the programming, fixturing, and having to mount and remove each blade for each side of the bevel, I think you'd be better off just getting the hang of free hand grinding.
 
Geoff Flato said:
Once you factor in the time and money building the machine, the programming, fixturing, and having to mount and remove each blade for each side of the bevel, I think you'd be better off just getting the hang of free hand grinding.
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Well Geoof, belt grinder ordinary used today a not cheap at all , especially if we take into account all the additional tools for it . Most likely to be over 5000 $ . Contact wheel in dif. Dia . rotary platen , small wheel , surface grind attachment ....... etc . Actually, that's the main reason why I started this topic .Price is so high that I will seriously consider to build something like this ....Parts for build a available and they are not expensive ..About grinding ..........WHY not say ten blade at once on machine like this ? I think that this kind of machine can do almost every different grind in one setup .Plus in one setup can be grind many different operation ? Like to taper the tang , flat grind , convex grind , hollow grind ....everything .With no need to change anything in belt grinder section except grit size for finish ? And there was the accuracy of the repetition in more than one copy ....
 
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