Question about Rockwell Speed Block Sander Model 330

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Rocwell model 330C finishing sander

When switch is turn ON , power is very slow , almost no energy

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My sander doesn't run at full speed - it's slow. I've changed the carbon brushes but this hasn't helped.


if it sparks a lot at the brushes , then there is an armature or winding fault
sanders are cheap so junk it and upgrade

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1 Answer

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You likely have something bound up or a bad bearing. Take the belt off and turn things by hand to verify they work smoothly
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1 Answer

It was working just fine. i turned it off, then


Check the switch for continuity. Check the brushes.

There may be a thermal fuse and some of those are one-shot that have to be replaced. They are usually embedded alongside the windings.

Switches sometimes get dust in them and don't contact inpsite of MOVING.

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Porter cable sander lost power.


Similar problem with my 7500 2x18" belt sander. Replaced the brushes today (didn;t look bad{ had sander 3 months to sand pistol grips. Sparks were flying from motor so replaced the brushes. Skil runs very slugis like its booging down, I think the only other possible solution is new bearings for me and perhaps you..

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go to Makitausa.com and type in your model number and you can download a schematic for the tool. Let me know if you can't find it or need more help

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1 Answer

Sander will operate only at a very low level of power.


It is either a bearing or bearings that are failing and causing the sander to slow down or the variable speed switch is failing.

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1 Answer

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1 Answer

How do i refill a finishing sander


Without any more detail about your particular finishing sander, I do not know whether this will help, AND I am no expert, but here goes ...

I inherited a Black and Decker 1/3 sheet sander, with no manual, from my late brother. It is not their newest model -- from the yellow plastic and the general looks and wear, I would say it is from the 1980s or 90s. The sand paper is held by a sort of spring clamp at both the front and back. There is a slot -- perhaps half an inch wide and a quarter inch tall -- in both of these spring clamps. I inserted a wide-bladed screwdriver into the slot, and pryed away from the sanding pad to open the clamp and insert the new 1/3 sheet.

Hope this helps!

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