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Delta 34-670 table saw loss of power

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Forum topic by pweissmd posted 06-22-2012 01:36 AM 5379 views 0 times favorited 7 replies Add to Favorites Watch
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pweissmd

2 posts in 1628 days


06-22-2012 01:36 AM

Topic tags/keywords: delta problem loss of power tablesaw

have a Delta 34-670 table saw I bought used 20 years ago. It has been fabulous – until today.

working on a project with a lot of 3/4” MDF. Saw was cutting it fine but after many cuts, the blade now stops (saw does not cut out!). Thought it was the blade – changed it to a new one – no difference.

This is a direct drive saw so it’s not a belt problem. Read in some of the other forums on Delta table saws that it could be I’ve worn the brushes out (good news) or that I am burning the motor out (bad news).

would appreciate any thoughts before I start taking it apart or looking for a new saw!!

Thanks!

-- Peter, Lake Anna, VA


7 replies so far

View TopamaxSurvivor's profile

TopamaxSurvivor

17669 posts in 3139 days


#1 posted 06-22-2012 01:53 AM

Check the brushes. May be stuck on the start winding. Rap it sharply with a mallet and / or move the blade and try to restart.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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MrUnix

4224 posts in 1662 days


#2 posted 06-22-2012 02:36 AM

When it stops cutting, do you hear the motor still running or does it just hum? There is a belt on that machine, but it is internal to the motor so it appears as if it were a direct drive universal motor. To fix it, you would need to drop the motor and dismantle it a bit. That would be my first guess. Brushes and bearings could also be the culprit, but it sure sounds like a slipping/worn belt problem from your description.

Belt in question is part #226 below:

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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knotscott

7211 posts in 2838 days


#3 posted 06-22-2012 03:05 AM

I think Brad’s on the right track. There is a small belt that could very well have broken.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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TopamaxSurvivor

17669 posts in 3139 days


#4 posted 06-22-2012 04:08 AM

Direct drive isn’t so direct, eh? ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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NormG

5506 posts in 2467 days


#5 posted 06-22-2012 04:20 AM

I know someone who just had their belt break, it was $13.00 plus shipping from EBAY

-- Norman - I never never make a mistake, I just change the design.

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pweissmd

2 posts in 1628 days


#6 posted 06-22-2012 01:00 PM

Wow! I’m impressed with the fast response. I think I’ll enjoy this group!!

MrUnix: a belt in the motor housing??! What a surprise – but may be a good one. I see part #226 above.

Yes – the blade stops spinning, I don’t hear any significant hum. Based on my limited experience, it seems like a slipping belt.

Building a couple of night stands using 3/4” MDF – pretty dense stuff and the “slipping” just got worse as I kept cutting.

Okay smart guys – how do I get to the motor?

Thanks again to all! Really appreciate the helpl!

-- Peter, Lake Anna, VA

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Knothead62

2581 posts in 2424 days


#7 posted 06-22-2012 01:04 PM

MrUnix, I find your expertise to be amazing. It is also amazing to see the knowledge and experience on the LJ forum!

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