I received this unit (some of its not assembled anymore) and need an
instruction manual. Does anyone know where I can find one?! Here is a
picture of the 31-520, although mine is in much better shape!
Thanks for any leads. BTW, is Rockwell owned by Delta now? Whats the
story on Rockwell, are they still around? I think this sander is from
the late 80's or early 90's.
Ah hell, that's just your run of the mill Finest 6" X 48"
Sander Ever Built unless you've got the pressed steel table
in which case we'll withhold judgement until you've had a
chance to see how it tracks.
No. The story, from the beginning and as quickly as I can.
In the beginning God made Herbert Tautz. Tautz went on to
begin Delta Specialty which became Delta Manufacturing Co.
Then in 1939 some nice men fro Timken Detroit Axle offered
Tautz one million dollars (a cajillion dollars after
inflation is figured) and Tautz sold. Tautz was a genius
and this last act only firmed up his grasp of doing the
Life went on it's merry way, the world was at war and Delta
flourished as an essential industry. Then in 1945ish
Rockwell Manufacturing (formerly Pittsburgh Equitable Meter)
bought Delta. Actually, Timken and Rockwell were the same
thingish and I suspect it was a paper transfer and not an
actual sale. Back to the story. Life continued it's
merriness with the exception of the Milwaukee plant being
closed. This went on for some time until the mid-70's when
Rockwell International (they morphed over the years) decided
that all that was holy and good could not be tolerated and
began a campaign to see to it that the Delta line sucked as
much as possible. In other words, the value engineered the
machines until they had a real quality problem.
This went of for a while until 1984 when the Penthair
Corporation bought the Rockwell machinery division and
re-badged it back to Delta.
It was in all the papers.
If you're up for it part of the story is here.
I'm predicting a 70's vintage. If you have a serial number
we can firm it up.
Oh, and the manual, have you checked the OWWM? Look under
Delta. Also, Ace Tool Repair will have it. Also, Delta's
Web page might have it if you can extrapolate the model
number up to something newer. The problem with Penthair is
they don't realize that Delta goes back to the 20's.
UA100, thanks for the info. Ace had a nice blowup diagram for me which made
the rework really easy!
My serial # is HC4486. I may tend to agree with you about its age. As I
cleaned it up I noticed it had been repaired a bit; rewelded where the belt
ate through the case a bit, and below the table to catch the dust on the
bottom was made at a later date out of aluminum. I'm not sure if there was
ever a cover for this area. It should work nice just the same. Its all clean
now and has a new belt and it looks great!
Now I just have to figure out how to mount the motor and base since I dont
have the original stand anymore. I'm planning on bolting them to one of my
2/4 table's tops and using a 4' belt. I bought one of those nifty, red link
V-belts that are supposed to reduce vibration.
That reminds me, while I was cleaning it I noticed that the spool coming off
of the motor is slightly warped. I couldn't get it off to straighten/replace
it though - even when the set screw was removed. I think its sort of melded
itself to the shaft of the motor, and although I can rotate it slightly when
I hold the motor shaft, it wont come off. Maybe the belt will take care of
some of the vibration that I'm sure is there. BTW, can I get a new spindle
(spool, whatever its called! Yunno the thing that the belt goes around) from
somewhere? Is this a standard size?
To answer your question, I'm not sure if its the "good one" or not. It has
what looks like a cast table that has been grinded on the top, just like my
Jet table saw. Its very heavy.
Thanks again for the reply. Its neat to clean up these old tools, replace
bolts... Sort of fun!
firstname.lastname@example.org (Subw00er) wrote in message
First off, check to see if there isn't a second set screw.
The purpose for the second set screw is to act as a "jamb
Next, buy a wheel puller from your local (insert name of
auto parts store franchise here).
If your pulley (sheave) is bent/not true you won't be doing
too much good with the link belt. You need a new pulley
Pulleys (sheaves) are as common as dirt. I would go with a
machined pulley like a Browning. Try McMaster-Carr or MSC.
The tale will be told when you go to see if the belt will
track and I don't mean when it's sitting there running with
no load on the belt. With a load on the belt you can expect
some mis-tracking depending on where you are placing
pressure but the tracking should not be erratic.
Sort of? I say, "a lot of", but then that's just me.
By the way, Pete Swelzen from down in Libertyville is
parting out a 6" X 48" on eBay. You might want to look at
some of his wares.
I would add the usual disclaimers but I really don't care.
I bought my 6" X 48" from Pete and he's trustable.
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