Coote Grinder question

Eric T. Maier

Eric T. Maier

Joined
Apr 29, 2000
Messages
573
Does anyone with a Coote Grinder find that the drive pulleys get in the way since they are directly connected to the contact wheel?

This is one thing I could forsee with this model.

Thanks for any help,

Eric
 
Eric, I've had one for about 9 years now and that has never been a problem for me. I've got the 8" wheel, I think with the 6" that could be a problem. The 10" would get you even further away. Its not a bad grinder for the price. I've got a Hardcore now but still have the old dog and use it more than the Hardcore.
 
I'm not sure that I'm following you here. The pulleys would usually be about 4" tall max. Way smaller than most contact wheels.:confused:

They/it would also be behind a steel plate on the left side of the grinder. You wouldn't be able to hit it, unless you wanted to.
 
My concerns are probably not a big deal. This will be my first grinder and all the others I've seen have the drive pulley and drive wheel in the rear so that's why I was wondering. I'd probably get the 10" wheel and I have a variable speed DC motor so I'd only need 1 pulley.

Thanks,

Eric
 
While I've got you guys here, the motor is a 4800 RPM variable DC. What pulleys (diameter) would you recommend? Do I want a 1 to 1 ratio so the grinder wheel could spin at 4800 RPM? That seems kind of fast to me.

Sorry for all the questions,

Eric
 
No.

Step pulleys are available from Norman Coote. Better balanced ones are available from KMG.
 
Seems to me, with variable speed, you'd just be wasting your $$ on step pulleys. A 4" on either end would do it.

I also would try not to max the RPM out. That is pretty fast, although, I think once you get it hooked up, the top speed will be somewhat less.

I've got an old Blademaster grinder that has step pulleys, left over from it's AC single speed days. When I went to variable speed, I just put the belt in the center pulley position on both of them(centers are the same size), and just use the speed control.
 
OK but since my motor is a variable speed I won't need "Step" pulleys, just one size for the motor and one for the grinder. What is the maximum SFPM that I should need? I suppose I could do the math after I find that out to see what diameter pulleys I need.

Thanks,

Eric
 
All I can say is 4800 rpms are to many for a coote, Norm only recommends 1750 rpm. I have a coote and thats my main grinder, I use step pulleys and grind at the slowest speed I can get, saves on belts, mistakes and fingers. I'm not telling you what to do, but I wouldn't crank it to 4800.

Have fun and be sure to wear your head protection. :D

Bill
 
You should step it down if using the high RPM DC motor that I am guessing you have (treadmill). It will provide greater torqe if able to run faster. So, get the step pulleys and step it down to the grinder. A 1 to 1 with your motor may bogg the motor down at slow speeds when you press your work piece against the platten.

RL
 
I was thinking of a 2" pulley on the motor and a 4" on the drive wheel of the Coote. That would cut it in half, right? I might even go a little bigger on Coote pulley.

No way would I run the Coote at 4800 RPM. I wonder what the SFPM of the belt woule be with a 10" wheel at 4800?! Probably around 6000 - 7000 SFPM!

Eric
 
You must log in or register to reply here.
Back
Top