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I have a 6in bench grinder it starts picks up speed but the second I apply any pressure it peters out and stops hel

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  • Grinders Master
  • 41,738 Answers

Probably the motor is failing.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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SOURCE: Bench Grinders Usage

Grinding is the fastest way to deburr a sharp corner or dress the end of threaded rod or bar stock that's been cut to length. Fit a grinder with a wire wheel, and you have a handy tool for removing rust. Then switch to a buffing wheel and you're ready to polish metal to a mirrorlike sheen. But for most of us, grinders are essential for shaping and sharpening hardened tool steel and high-speed steel.

Posted on Aug 27, 2008

  • 2712 Answers

SOURCE: Bench Grinders Safety issues

Goggles or safety glasses need to be worn to protect the operator's eyes from the sparks and metal filings that result. Depending on the workpiece and time of exposure, hearing protection may also be required, the dust produced is also potentially hazardous. The toolrest (or workrest) should be mounted slightly below the center of the grinding wheel with less than 3 mm clearance from the wheel. This prevents the work from jamming between the toolrest and the wheel. Grinding wheels designed for steel should not be used for grinding softer metals, like aluminium. The soft metal gets lodged in the pores of the wheel and expand with the heat of grinding. This can dislodge pieces of the grinding wheel. Wire brushes require particular attention for the safety of the operator and bystanders as the metal wires may become dangerous projectiles as they could bind with the object being brushed and so throw it away with great energy. The machine needs to be securely mounted to a pillar or a bench to be used safely and effectively, often with an emergency stop switch or pedal fitted close by the machine, for use in emergencies.

Posted on Aug 27, 2008

  • 1 Answer

SOURCE: grinder won't stay running

what is the mf(microfarad) rating and the voltage,then go to an industrial electical shopand buy one for the correct voltage and an (mf) equal or greater ,but not by more than 10%---mine cost $9.00-in Maine---good luck- MATT

Posted on Jan 04, 2009

  • 718 Answers

SOURCE: switch and capacitor crapped out on 1/2 hp Sears bench grinder

Replacement should be simple. Just do a one for one hookup with the new part, after you unplug it first.
For a diagram go to;

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=397.1949&productCategoryId=0721000&brandId=0247&modelName=CRAFTSMAN-1%2F2-H.P.-GRINDER&diagramPageId=00001&documentId=00023041&pop=flush

Posted on Mar 28, 2009

  • 172 Answers

SOURCE: Need part numbers to replace eyeshields on Dayton bench grinder

Your grinder is listed on page 3085 of the Grainger catalogue. The part number for the eyeshield is 00281.00 and the number for the lower eyeshield bracket is 00280.00. The right hand upper eyeshield bracket is number 25188.00 and the upper left hand bracket number is 25177.00. All of this can be ordered through Grainger at 1-800-323-0620. Marvin T.

Posted on Jan 13, 2010

Testimonial: "This was very helpful. I have ordered parts from Grainger. Thank You."

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1 Answer

Porter cable


DO NOT leave it that way - that fuse is for YOUR protection, and the protection of your family and neighbors.

That humming is probably an byproduct of the speed control, not too much to worry about. The vibration should go away almost entirely when you reset the wheels to run true and dress them to balance.

The capacitor is your starting capacitor - its voltage rating is completely unimportant - that's a max voltage rating, and they only wanted to stock one capacitor, not have one for the 120V versions and a second one for the 240V versions.

Did you by chance start working on this grinder while it was still under warranty?

If the wheels turn freely when the power's off, and if the grinder doesn't get awfully warm when it's in use, then I'd think that the problem is within the speed control board.

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1 Answer

I have a single speed Delta 8" bench grinder. How


as for slowing it down, no problem. Hook it to a cord with a dimmer switch connected to it. Make sure your running with the same power rating though. As for a dripper, no ideas just yet.

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My ryobie bench grinder keeps tripping the rcd within a second of turning it on?


Assuming your local tech confirms that your bench grinder tests ok. The problem is probably that the grinder draws too much current for the RCD and is therefore detected as an earth leakage. High amperage devices often do that. Your best bet would be to plug it in to a socket which is on a non-rcd circuit. Maybe you have an RCD on the whole house though? I would start with returning the grinder and trying a different brand with a lower amperage/wattage rating. If that doesnt work, I would call an electrician to discuss installing a different RCD or running a separate circuit for your power tools.

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1 Answer

My 6 inch Cummins bench grinder stopped working. When you turn on the switch it only has a quiet hum. Is it the capacitor?


Try wrapping a thin cord around the shaft many times to allow the shaft to be spun in the normal running direction when pulled. Pull sharply on the cord and turn the motor on--if the starting capacitor is bad, the motor should continue to run until shut off. If there is no capacitor, then the motor uses a start winding and a centrifugal switch to start. The switch is supposed to open when the motor comes up to speed. If you used to hear a loud 'click' when the motor was shut off and slowing down, then you likely have the start winding and switch. If the contacts on the switch become burned and not make contact, then it will display the symptoms you mention. You will need to access one or the other end covers to reach the switch. Hope this helps!

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1 Answer

No control of speed on bench grinder,need schematic


Unless the motor is a brush type universal unit, there is commonly no way to change the speed of an induction motor. There are AC motor speed control units available, but cost more than the grinder as they change the frequency as well as the voltage. There are speed controllable grinders available that use brushes so that simple electronics can control speed. Hope this helps!

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1 Answer

I need an owners manual for delta gr450 8


Here's a link to download the pdf.
http://www.dewaltservicenet.com/documents/English/Instruction%20Manual/Delta/A15786.pdf

If it doesn't work, start here:
http://www.deltaportercable.com

Mar 02, 2010 | Delta Shopmaster 8" Bench Grinder

1 Answer

Grinder starts and runs then peters out and gets pretty warm. Is capaciter bad?


Most probably. the motor will overamp, get hot and go out on internal overload.

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Grinder starts and stops on startup


if this is a cap start motor and not a centrifugal start run motor then bad cap is good place to start

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2 Answers

Grinder won't stay running


The capacitor is easy to change and can be matched once you remove it by any electronics parts house.

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