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Emergency field operation to Delta cabinet saw

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Forum topic by philip marcou posted 06-10-2011 02:48 PM 1088 views 0 times favorited 7 replies Add to Favorites Watch
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philip marcou

262 posts in 2062 days


06-10-2011 02:48 PM

I have been aware for some time that the motor bearings on this saw were ill, and yesterday a new squealing noise confirmed that I should replace them without delay as I am in the middle of a job which requires much ripping and dimensioning of rough sawn stock.
I would say that the pictures are self explanatory but also want to add that I wanted to do the work as fast as possible-no luxury of stripping and cleaning, painting etc. No donning of white coats or sanitation of the work area-in fact the motor was opened up on the floor (since American motor maker Marathon didn’t provide a terminal block for convenience of quick detachment from power supply).I just managed to to sweep the floor and blow some dust to another location before setting to….
After removal of the top and extensions in one piece it is easier to remove and replace . the motor , which is heavy, by setting the machine on its side. The top is heavy but one normal man can handle it if he is careful.
I also took the opportunity to give the commutator a light skim to keep it happy-the last time this motor was worked on by me was some time in the mid eighties . Would have been nice to get the windings “shellacked” but not this time.
The saw spindle bearings were rough when spinning the shaft by hand so that assembly was removed and the bearings extracted. Original bearings in this saw were New Departure wide body type and I couldn’t get these when I rebuilt that saw in 198something, so had to convert it to common bearings by use of those two brass spacers to take up the space . I saw no reason to revert to wide body bearings again since almost 30 years have gone by on the common 6203 bearings. The motor had standard 6204 bearings.
Then four bearings cost NZ$40 , the job took about two hours and the saw is now as right as rain.

To be continued…


7 replies so far

View Bertha's profile

Bertha

13003 posts in 2158 days


#1 posted 06-10-2011 03:03 PM

Outstanding rescue! Look at the arms on that old beast!

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View Lee Barker's profile

Lee Barker

2170 posts in 2316 days


#2 posted 06-10-2011 05:48 PM

Wonderful tutorial, demythologizing the process and demonstrating grace under fire.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

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MedicKen

1610 posts in 2927 days


#3 posted 06-10-2011 06:31 PM

If I were you I would replace the motor bearings with the 6204’s. They are extended inner race for a reason. They keep the rotor properly aligned with the windings. If you want a cheaper place to acquire bearins I would contact Lynne Scott at Accurate bearing in Illinois. They have the best prices of ANY retailer in the US and she knows her stuff. The 6204”s from Accurate will run about $12 ea.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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philip marcou

262 posts in 2062 days


#4 posted 06-10-2011 11:10 PM

Ken, Thanks for that information: I had assumed that ordinary 6204’s were standard. I am pretty sure the extended inner race version is available here in New Zealand and I will put them back into that motor. Thinking about it now, if the rotor moved towards the end plate enough the commutator would be damaged, but then again it has run with ordinary bearings for years.

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philip marcou

262 posts in 2062 days


#5 posted 06-10-2011 11:15 PM

August, no the brushes (carbons) were fine, plenty of life left. Amazing that they can last so long.

View MedicKen's profile

MedicKen

1610 posts in 2927 days


#6 posted 06-11-2011 03:59 AM

Philip…...I will double check the bearings on owwm. The WIKI portion of the site is down for maintenance at the moment. I amy have mis-quoted and named the bearings for the 3ph bullet, not the RI that you have

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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MedicKen

1610 posts in 2927 days


#7 posted 06-11-2011 05:10 AM

http://wiki.owwm.com/ReplacementBearingList.ashx#Unisaw_17

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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