john brady
01-19-2015, 11:01 AM
Hello All!
This forum (General Woodworking & Power Tools), seemed to be the closest one for my question. I have a Delta GR250 6" variable speed grinder that I purchased a little over 10 years ago. I only use it for sharpening my lathe tools, so it hasn't had a lot of heavy use over the years-- just short bursts of on-sharpen-off cycles. Since I only use it for sharpening tools, I always had the speed set to the lowest setting and it always worked fine.
But then about two months ago, I noticed the grinder would vibrate when I'd turn it on. I assumed the wheel needed balance, but then realized it was because the speed had increase dramatically, despite the dial being turned all the way down (to the lowest speed). When I mentioned this to my son he said it was the speed dial, which is technically called a "potentiometer" (or "pot" for short) and that was typically how they act when they go bad.
I removed the access panel so I could see what the pot looked like, and see if it had any markings that I could reference to get a new one, but it doesn't have any markings on it whatsoever, so I'm kind of stuck. I found plenty of them for sale (the biggest selection seemed to be at a place called ExpressParts.com that sells parts for guitars and amps), but before I can order one, I need some help to determine what size I need to order.
Sooooo, I was hoping someone here may have had the same issue and replace theirs, or some of you guys might be familiar with them and would be able to tell me what size I need to order.
The grinder has since settled down just as mysteriously as it it began, but before it acts up again, I'd like to have a new one on hand. The grinder specs are: 110-volts, 2-AMP's with a speed range of minimum 2,000 RPM's to maximum 3450 RPM's. Hopefully this is enough information to help anyone knowledgeable about them to identify what I would need. But if not, here is a link to an actual photo of the pot AND a snapshot of the label from the rear of the grinder: http://www.jebswebsite.com/misc_pics/grinder_potentiometer_group.jpg.
Any help or suggestions anyone could offer would be appreciated.
Cordially...John
John E. Brady
JEB's PENs
www.jebspens.com (http://www.jebspens.com)
Hand-turned Pens / Pencils
& Custom Fountain Pens
This forum (General Woodworking & Power Tools), seemed to be the closest one for my question. I have a Delta GR250 6" variable speed grinder that I purchased a little over 10 years ago. I only use it for sharpening my lathe tools, so it hasn't had a lot of heavy use over the years-- just short bursts of on-sharpen-off cycles. Since I only use it for sharpening tools, I always had the speed set to the lowest setting and it always worked fine.
But then about two months ago, I noticed the grinder would vibrate when I'd turn it on. I assumed the wheel needed balance, but then realized it was because the speed had increase dramatically, despite the dial being turned all the way down (to the lowest speed). When I mentioned this to my son he said it was the speed dial, which is technically called a "potentiometer" (or "pot" for short) and that was typically how they act when they go bad.
I removed the access panel so I could see what the pot looked like, and see if it had any markings that I could reference to get a new one, but it doesn't have any markings on it whatsoever, so I'm kind of stuck. I found plenty of them for sale (the biggest selection seemed to be at a place called ExpressParts.com that sells parts for guitars and amps), but before I can order one, I need some help to determine what size I need to order.
Sooooo, I was hoping someone here may have had the same issue and replace theirs, or some of you guys might be familiar with them and would be able to tell me what size I need to order.
The grinder has since settled down just as mysteriously as it it began, but before it acts up again, I'd like to have a new one on hand. The grinder specs are: 110-volts, 2-AMP's with a speed range of minimum 2,000 RPM's to maximum 3450 RPM's. Hopefully this is enough information to help anyone knowledgeable about them to identify what I would need. But if not, here is a link to an actual photo of the pot AND a snapshot of the label from the rear of the grinder: http://www.jebswebsite.com/misc_pics/grinder_potentiometer_group.jpg.
Any help or suggestions anyone could offer would be appreciated.
Cordially...John
John E. Brady
JEB's PENs
www.jebspens.com (http://www.jebspens.com)
Hand-turned Pens / Pencils
& Custom Fountain Pens