Looking for a gear for Delta 31-250 drum sander

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Forum topic by pwalter posted 12-24-2014 01:55 PM 1521 views 0 times favorited 3 replies Add to Favorites Watch
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79 posts in 2734 days

12-24-2014 01:55 PM

Topic tags/keywords: sander gear delta

I have stripped out gear from a Delta 31-250 drum sander. The gears are from a 90v DC motor. I know absolutely nothing about gears, but I did take some measurements.

The gear has a larger gear, and a smaller gear built together. The bottom gear outside diameter is 1.35 inches and the smaller gear diameter is .35 inches.

The larger gear has 50 teeth that are angled, and the top gear has 9 teeth that are straight.

The thickness of the larger gear is .19 inches and the total height of the 2 gears is .47 but I have read that the total height isn’t exactly critical for this application.

There is a hole through the center of the gear. The hole measures .110 inches.

I am hoping that one of you guys are able to help. I have had this broken drum sander in my shop for over a year now, and it would be nice to have it back up and running.

3 replies so far

View pjones46's profile


1001 posts in 2792 days

#1 posted 12-24-2014 08:48 PM

Have you tried Delta Parts 1.

Here is Delta site help.

-- Respectfully, Paul

View runswithscissors's profile


2846 posts in 2174 days

#2 posted 12-25-2014 07:37 AM

You might google Applied Industrial Technologies. They have all kinds of gears and gear combinations. I assume the part you are trying to fix is the drive for the conveying belt. As long as you can get close to the same gear ratios, but have the centers (shafts) properly lined up, that a slightly different ratio wouldn’t be a problem. The dc motor is a variable speed, probably, so the real speed control is in the electronics.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View pjones46's profile


1001 posts in 2792 days

#3 posted 12-25-2014 08:37 AM

Do you have the Delta Part numbers? If not go to the Delta site for the Parts List# get the part number and see if it is available from them. If Not do a seach on google for the part.

I just ordered a drum assembly for Tool Parts Pro as Delta said it was out of stock on their site and it was cheaper anyway.

If the gears are for the 90 volt drive motor read this, however, the motor unit is here.. Big bucks.

-- Respectfully, Paul

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