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Motor issues

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Blog entry by conwaydog posted 02-10-2008 06:03 PM 708 reads 0 times favorited 6 comments Add to Favorites Watch

I purchase a used old shopsmith and a few tools about 3mo ago for a couple hundred bucks. Last night while turning a pen the motor started to loose power and eventually stopped. I turned off the switch and let it set a few miniutes and tried to power it up again but no luck. This morning I turned it on and it turned about 10sec. and stopped. Any hope or is the motor shot?



6 comments so far

View Todd A. Clippinger's profile

Todd A. Clippinger

8791 posts in 2852 days


#1 posted 02-10-2008 06:34 PM

Is there a burning motor smell that goes with that?

I don’t know about the ShopSmith units but I have replaced motors before that had a similar behavior but the smell made it obvious that it was burnt out.

Better motors have an overload trip built into them. If they get too hot they shut down. If the windings are bad this will generate heat and cause it to shut down until it cools. Turning the motor off for a while as you do activates the reset or there may be a button to push on the motor.

This is a situation that can quickly deteriorate as the life of the motor will quickly fizzle out once it has been overheated.

-- Todd A. Clippinger, Montana, http://americancraftsmanworkshop.com

View Todd A. Clippinger's profile

Todd A. Clippinger

8791 posts in 2852 days


#2 posted 02-10-2008 06:35 PM

The motor situation may be the reason for the low price.

When you get a new motor make sure it has the overload protection.

The motor that you have now may not even have the overload protection.

-- Todd A. Clippinger, Montana, http://americancraftsmanworkshop.com

View Dadoo's profile

Dadoo

1777 posts in 2743 days


#3 posted 02-11-2008 02:37 AM

Also, check your brushes for length and the communtator for carbon buildup. If you’re any good with hand tools, you can take the armature out and clean the communtator…the part where the brushes contact. Be careful to release the brushes from the communtator otherwise you’ll break them when you pull the armature. I’ve polished mine starting with a 150 grit Emery cloth, working up to a 400grit. Lightly grease your bearings before you put it together again. Do not get grease on the communtator.

The brushes sometimes have a mark on them so you can replace them when they’re worn out. If you’ve gone as far as pulling the armature, you can look inside and see how far the brushes protrude. Replace if they have a weak contact.

Shopsmith is pretty cool in the fact that they’ve the same parts for most all their tools. I have a 1948 Shopsmith 10E here, and the 1/2HP motor is externally mounted. Would be fairly easy to upgrade this to a 3/4HP or stronger motor. Sadly though, I’ve also got a 25 year old, single speed Black and Decker drill that I’ve cleaned and saved. This thing should’ve gone to the trash bin 15 years ago! Still works like a champ…just can’t bring myself to parting with a working tool!

-- Bob Vila would be so proud of you!

View conwaydog's profile

conwaydog

42 posts in 2522 days


#4 posted 02-11-2008 05:00 AM

I dont trust myself enough so I am taking it to be checked tomorrow. I pulled the motor out and turned it on and it ran very smooth but as soon as you put any load on it the thing freezes up.

View Todd A. Clippinger's profile

Todd A. Clippinger

8791 posts in 2852 days


#5 posted 02-11-2008 06:17 AM

Yep, safest bet is to take it in.

I replace fried motors and if they can be serviced I take them in to a shop. There is no shame in that. As a contractor I don’t need to know it all, I just need to know who to call.

-- Todd A. Clippinger, Montana, http://americancraftsmanworkshop.com

View Dadoo's profile

Dadoo

1777 posts in 2743 days


#6 posted 02-11-2008 12:59 PM

There ya go! How old is your motor? Maybe they can upgrade it? The biggest complaint I’ve heard about Shopsmith is the weak motor, esp. when cutting hardwoods. So if you can get a stronger motor, it would be money wisely spent.

-- Bob Vila would be so proud of you!

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