Drum Sander problems

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Forum topic by jlt posted 02-03-2012 02:58 PM 2355 views 0 times favorited 19 replies Add to Favorites Watch
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30 posts in 2586 days

02-03-2012 02:58 PM

I have a Delta 18-36 drum sander that I purchased used about a year ago. I have used it some but not excessively. I have replaced the spiral wound abrasive a couple of times. The problem I have now is that the wide abrasive belt that conveys the material under the drum is no longer moving. When I just turn on the switch, I can hear the motor running but no movement. I haven’t tried to take anything apart yet. I thought it might be useful to see if anyone on the LJ forums may have an idea of what is going on? I already realize that belt tension may be the first place to look, although it is not that it is slipping but rather, not turning at all, even with no board on it.

Thanks to anyone who may have an insight on this one.

19 replies so far

View Peter Oxley's profile

Peter Oxley

1426 posts in 4108 days

#1 posted 02-03-2012 04:22 PM

I don’t have that machine, but it sounds like maybe the setscrew has come loose on one of the belt pulleys.

-- -- --

View gfadvm's profile


14940 posts in 2924 days

#2 posted 02-04-2012 04:41 AM

I think Peter nailed it. If not check the tension. Is the shaft turning but not moving the belt?

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View Loren's profile


10477 posts in 3882 days

#3 posted 02-04-2012 06:11 AM

Check the linkage of the DC variable speed drive motor with the
drive roller for the conveyer (the other roller is an idler). The
linkage may be “corncobbed” or otherwise disconnected and/or

View jlt's profile


30 posts in 2586 days

#4 posted 02-06-2012 07:35 PM

Nice. I think I’ve found the problem. I need new motor brushes. No problem, you may think, except that Delta has made this part obsolete with no replacement part. They will still sell you a new motor for $356 but you will never be able to replace a wear part, the brushes. I will NEVER buy anything Delta again!!! So I have a thousand dollar boat anchor, unless I can get a motor repair shop to make me some brushes. I’d rather be wood working than battling this one.

View gfadvm's profile


14940 posts in 2924 days

#5 posted 02-07-2012 12:51 AM

I’m suprised the motor will run if the brushes are shot but still not a big problem. There are a lot of electric motor shops that rebuild/fix elec motors for not a lot of $ and they seem as good as new after they are rebuilt.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View bbjjj's profile


29 posts in 2565 days

#6 posted 02-07-2012 06:09 AM

I have purchased brushes from these folks I have a B & D industrial shop vac that is about 30 years old and the brushes were worn out and are no longer available. I bought new brushes from EURTON ELECTRIC and the vac. works great, I have been using the shop vac regularly for about 20 years. The brushes cost me about $45 with shipping, but the vacuum has a 15 amp motor and can suck the carpet right off the floor. I also bought brushes for a SHOP-VAC QSP 6.5 that cost about $32 with shipping. You will have to search through there brushes section by type or style then by physical size.

View tuffruss's profile


38 posts in 2616 days

#7 posted 02-07-2012 09:44 AM

I always save the brushes out of broken tools so usually find some to fit. If they are a little big file them to size they are carbon which files easily. I bet any electric motor shop can help.

View bluekingfisher's profile


1311 posts in 3213 days

#8 posted 02-07-2012 11:39 AM

I’m surprised to note the brushes have worn out after a year?? are you defo sure worn brushes are the problem? if they are worn, either they were defective in the fisrt place or there is another problem causing them to wear out so quickly.

I have no experience of the Delta model but I have a Jet 16-32. On mine there are in effect two controls. One to start the motor for the cylinder and the other has a speed controller for the conveyor belt. Even when I turn the conveyor control on there is a hum from the motor but the belt doesn’t start to turn untill I crank up the speed to about 10 on the dial. If you are hearing a hum that is a positive sign, at least power is getting to the motor. If it were brushes it may be noiser and spark a lot. That sais I had an old Delta chop saw and the brushes welded themselves to the motor and guess what, they stopped making the brushes so it ended up in the trash.

I would think before I start shelling out for brushes (which may or may not be the issue) I would check all the simple issues first. Is there anything jamming the drive belt? such as sawdust, sliver of wood, a dropped or misplaced too etc? Could it be that the conveyor belt has tightened, meaning the rollers wouldn’t be able to drive the belt causing the humming noise. Have you checked all contacts on the starters and motor, they too could be clogged with sawdust. A gentle blast with compressed air is worth a shot.

Good luck with it, I know how frustrating these things can be.


-- No one plans to fail, they just, just fail to plan

View usnret's profile


184 posts in 2742 days

#9 posted 02-07-2012 11:50 AM

Take your brushes and go to your local Ace Hardware store. They carry brushes for electric motors. They are sorted by brand, but check them all for a match.

-- Chief Petty Officer USN(RET) 1991-2011

View GodofBiscuits's profile


97 posts in 3309 days

#10 posted 02-12-2012 06:49 AM

Something is bugging me here. You state that you can turn on the motor and here it running but the conveyer belt is not moving? is this correct? if this is in fact what you are saying then the brushes are not your issue here. Brushes don’t just wear out after a year of minimum use. I have a craftsman hand drill that is a good 35 years old that is on it’s original brushes so one year of minimal use makes me very suspicious. I would make certain that the pully has not worked itself free of the motor or the gear/belt driving the conveyer has not worked itself loose. a motor with bad brushes either won’t run at all or will run erratically but the belt would still move as the motor does.

-- Are you going to use that piece of scrap?

View Howie's profile


2656 posts in 3157 days

#11 posted 02-12-2012 12:48 PM

Along with the other suggestions above,check and make sure the “pin” in the coupling isn’t sheared. (if it has one)

-- Life is good.

View Fred Hargis's profile

Fred Hargis

5229 posts in 2727 days

#12 posted 02-12-2012 01:00 PM

I think those are 90V DC gear motors, and are not special in any way. Take a look at this link and you ay find a replacement for a whole lot less money; Delta parts prices border on fantasy. Also, taking that to a motor shop is a good idea to determine if the motor is bad. The can usually fix most anything for a reasonable price. But there may also be a problem with the speed controller, and that may be a little harder to resolve. They are expensive and (I think) on back order at Delta.

-- Our village hasn't lost it's idiot, he was elected to congress.

View waho6o9's profile


8539 posts in 2811 days

#13 posted 02-12-2012 01:20 PM

For price comparison, or if you need another part these folks are quite helpful.

View jlt's profile


30 posts in 2586 days

#14 posted 02-15-2012 12:20 AM

Interesting Fred. I did take the motor to a motor repair shop and they guy found that the PLASTIC gears in the gear motor were shot. Is it typical to use plastic for the gears in these motors? So, straight from Delta, they have a retail price of $356 for the motor. Wrong. Grainger price, $200. Still a little stiff. How do I know if I’m just getting more plastic parts to wear out? The motors on Fred’s link look promising, especially the first few. Now my dilemna is that I did not pick up the motor from the motor shop after he called and said it was no good. I’m not sure of the RPMs. Otherwise, it may well be worth it to try one of the motors on Fred’s link. Anyone have any more thoughts about this?

View jlt's profile


30 posts in 2586 days

#15 posted 04-27-2012 09:25 PM

Damn! I got the new gear motor after a lengthy delay in dealing with Grainger as an individual. I put the new motor on and in the third pass of the first board through the sander, the motor has quit again. I don’t know where I’m going from here but I don’t think I want to buy another gear motor. I’m pretty bummed. I have projects I would like to use the sander for.

showing 1 through 15 of 19 replies

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