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Jet 1632 Drum sander - broke belt motor drive gear

6K views 45 replies 13 participants last post by  dougmccubbins 
#1 · (Edited by Moderator)
Happy Saturday to everyone but me!

I have appeared to have sheared off 3 teeth on the belt motor drive gear, which is the gear that is attached to the shaft coming out of the motor transmission housing.

Does anyone know if Jet or anyone else sells replacement gears, or will I be stuck replacing the whole motor for $300? :-/ :-/ :-/.
 
#7 · (Edited by Moderator)
That's what I figured. If Jet doesn't sell it separately they might be able to give you the specs on the gear and you can order one from a gear supplier.

Or….look for a local machine shop who can make one for you

Or….use a $49 MAP gas torch from Lowes and braze and grind that one and repair it. It can't be all that heavy duty if the gears broke before the breaker tripped.
 
#8 ·
You could try looking at bostongear.com It will require a bit of research on your part. I think it is much easier with a catalog than online. It would be tough to find a machine shop willing to setup to cut one gear for a reasonable price.
The drive is most likely a standard product from another supplier.
 
#10 · (Edited by Moderator)
It would be tough to find a machine shop willing to setup to cut one gear for a reasonable price.
The drive is most likely a standard product from another supplier.
- JoeK1
Very true. Somebody sells that gear. I doubt it's a "Jet" custom gear. Somebody in Asia makes those gears by the thousands every day.

Worst case senecio, get some soft steel and make one.

- CWWoodworking
Also true but I just thought it'd be easier to try and braze and file a couple of teeth. Find someone with a torch that can fill in the gear then file th teeth back in. Just a thought since it's agreed that $200+ for a new motor is silly.
 
#12 ·
Great suggestions, thanks everyone. I ll update the thread when I get a chance to talk to Jet. Does anyone have resources online on how to measure/identify gears? I know basically nothing about them.

- ChrisBarrett
Whatever company your buying it from will tell you how to measure.

My guess would be #of teeth, O.D., I.D., thickness. Calipers is a useful tool.
 
#16 ·
Maybe you could find another gear box with similar specs and still use the motor? If not, you may be able to find a cheaper motor and gearbox combo from Grizzly or one of the other vendors. For example Grizzly P0458Z042 is $171. In the parts schematic it looks similar to the Jet motor/gearbox but it's hard to know for sure. You may have to get specs and measurements and search the companies that sell convery motor gearboxes and see if anyone sells a cheaper one.
 
#17 · (Edited by Moderator)
When you call Jet tell them what happened. They might just send you another gear if they have them. But something tells me they buy that assembly as a unit. Send them the pic of the gear (not the wood). Like I said, I'm surprised that the gear is weaker than the motor. Most any other power tool will trip an internal or external breaker before it tears itself apart. Maybe they have a burnt out motor assembly they can send you. Ya never know.
 
#19 ·
i had the older delta sander that had plastic gears, took forever but did find a chinese jt that made them, at first choked on price then kept searching till i found them cheaper, i'll try and find the link but its been a year or two and i replaced it with a performax that i struggle with.
best of luck all recommendations above short of the buying full new replacement is a better option for sure.
will advise if i can find the link
Rj in az
 
#20 ·
#22 ·
I disassembled the motor and gear housing. Unfortunately there are no distinguising marks at all on the entire assembly. I measured the broken gear.
37 teeth
Diameter: 41mm
Shaft bore: 5/16"
collar diameter: 13.50mm
gear thickness: 4.94mm
Tooth cut depth: ~ 2.15mm
tooth width bottom: 2.20mm
tooth width top: 1.30mm

Here are some pictures I took.










The marking on this last one I think says "107.46" . No idea what that is for.
 
#23 ·
I talked to Jet warranty service, that fellow didn't know how to find out the info about who makes the gear motor but did send me the warranty form. This may be covered under warranty - oddly enough the belt has stopped moving from the very beginning and I've only operated the sander for about 10 hours total over the past 7 months. I suspect a tooth was missing - or had broken off right away and I just didn't realize that's what the belt stopping meant.
 
#24 ·
I'm new to Lumberjocks, but have lurked for years!

Anyhow, in the event that Jet does provide warranty service and you are unable to buy a replacement gear from Jet, there are a number of sources for you to try. Several names are Bearing Inc. and Erie Bearing. Both have stores throughout many states and both can get gears. The trick is to take the broken gear in, along with the mating gear. You may need to buy both, and by buying both, they don't need to exactly match your broken gear, just each other.
 
#25 · (Edited by Moderator)
FWIW:

There is nothing magical about a gear reduction motor.
But then I have designed systems using them? LOL

Bodine, Brother, Panasonic, Oriental Motor, Grainger, Digikey, and many more; all sell them.

Like regular motors, there is industry standardization on sizes and reduction ratios that can allow 'universal' replacement, assuming the mfg hasn't done something custom.

Some folks even sell the gear boxes separately, like the World K series from Oriental Motor:
https://catalog.orientalmotor.com/viewitems/world-k-series-single-phase-ac-motors/25w-world-k-series-single-phase-ac-gear-motors

Have to dig through the Oriental Motor Catalog to find them,
https://www.orientalmotor.com/products/pdfs/2012-2013/C/usa_ac_ind.pdf

Example: 25W 25:1 gearbox =
https://catalog.orientalmotor.com/item/all-categories/gearheads-2/4gn25sa

Typically when you have gear failure in small reduction motor, all the other gears in box are suspected as being damaged. Especially if made from plastic or die cast metal. It is very hard to break off teeth from one gear and not stretch or damage teeth on another gear. So when a gear fails, historically you replace all the gears in box (or gear box) to prevent the need for another repair when the other 'worn' gears create more problems.

Suggest instead of measuring the gear that you measure the size of gear head/motor, shaft locations, mounting holes; and look for generic replacement?

BTW - Gear reduction motors with metal gears are not cheap. Will be challenge to find a 25W 1/30Hp motor for less than ~$150 on retail parts level. You can get them for less, but you have to buy pallets of them direct from mfg.

If Jet won't replace motor/gearbox under warranty, then maybe this information will help you find a replacement.

Best Luck.
 
#26 ·
Captain,
Easy for you to say! :p So the gear that broke looks like it's cast, the gear it was mating with looks like it was cut from steel, and then the gear between that and the motor spindle is plastic… lol. In this case, I believe the gear box is a cast part of the motor housing. so I don't think it would be super easy to find a way to just to attach a new gear box to the existing motor.
 
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