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Forum topic by Pennman posted 11-14-2018 03:10 PM 695 views 0 times favorited 13 replies Add to Favorites Watch
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Pennman

3 posts in 32 days


11-14-2018 03:10 PM

Topic tags/keywords: jointer cast iron delta milwaukee question

New to the site this evening. I picked up a jointer on the cheap with the intention of restoring it. All seems to be in good shape and it cut true off the truck. The tables and fence, however, are causing me distress. They have a strange finish and I can’t seem to figure out what it is from the google. They aren’t smooth. Rather, they each have a strange pattern of knicks or swirls. They cover the entire table and fence without discrepancy, they are very shallow, less than a thou. Any idea what happened to this old machine?

The machine

The table

The fence

Close up of table


13 replies so far

View HokieKen's profile

HokieKen

7130 posts in 1341 days


#1 posted 11-14-2018 03:23 PM

Those are tell-tale signs of a hand-scraped surface. That’s a good thing. Usually. However, if it isn’t flat and smooth, it was likely done by someone who didn’t really know what they were doing.

-- Kenny, SW VA, Go Hokies!!!

View msinc's profile

msinc

569 posts in 706 days


#2 posted 11-14-2018 03:50 PM

That’s almost a little too “consistent” looking or “patterned” to me to be done by hand…could that be where they flame hardened the surface? I have seen similar surface markings on the ways of older metal working machines. I had a South bend lathe that dated back to the 40’s with similar markings on the ways. You don’t see flame hardening done on domestic machinery much if at all these days, I guess they have figured out a better, easier, faster way? It can sometimes still be seen on some Asian machines. Google “flame hardened bed ways” and click on images…scroll thru and you will see some similar looking patterns.
If the surface is flat enough to join boards straight I don’t know that I would worry about what it is or how it got there. It’s interesting, whatever it is.

View Bill White's profile

Bill White

5128 posts in 4163 days


#3 posted 11-14-2018 04:27 PM

If it is flat……………..use it that way (no pun intended).

-- bill@magraphics.us

View Phil32's profile

Phil32

271 posts in 106 days


#4 posted 11-14-2018 04:32 PM

Could it be the result of someone’s effort to remove surface rust . . . with a rasp?

-- Phil Allin - Ventura, CA

View Pennman's profile

Pennman

3 posts in 32 days


#5 posted 11-14-2018 04:47 PM

Both the tables and fence are dead flat. It’s not the functionality that bothers me, it’s the mystery. The fence in particular with those semi circle swirls. When I get old machines, the story is half the interest to me.

View HokieKen's profile

HokieKen

7130 posts in 1341 days


#6 posted 11-14-2018 04:55 PM

Different patterns were left when scraping machine surfaces. Frosting and flaking being the two most common. IIRC, the bed on yours is frosted and the fence is flaked. The purpose of leaving those patterns on machine ways and in dovetail slides etc. was for oil retention on the surface. So, I’m not sure exactly why it would have been done as such on your jointer since you don’t want oil transfer to your workpiece.

-- Kenny, SW VA, Go Hokies!!!

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Pennman

3 posts in 32 days


#7 posted 11-14-2018 05:02 PM

I friggin love Frosted Flakes. But on the serious, I was able to find several articles and it displays these surfaces perfectly. Thanks so much for the direction.

View Aj2's profile

Aj2

1881 posts in 2001 days


#8 posted 11-14-2018 05:40 PM

That is a hand scraped surface.
Almost a lost art I’ve done some scraping myself it’s a labor of love and very precise.
That’s a nice jointer

-- Aj

View Bill Berklich's profile

Bill Berklich

479 posts in 591 days


#9 posted 11-14-2018 05:44 PM

Looks like it was dekeled. It’s an old iron process to provide a surface that will hole oil usual used for sliding parts. They would dekel after surface grinding

-- Bill - Rochester MI

View HokieKen's profile

HokieKen

7130 posts in 1341 days


#10 posted 11-14-2018 05:49 PM

Well dang Bill. You either win “most knowledgeable” or “best at making up words” ;-) I’ve never heard of dekeling and apparently neither has Google!

-- Kenny, SW VA, Go Hokies!!!

View bilyo's profile

bilyo

421 posts in 1305 days


#11 posted 11-14-2018 07:44 PM

That is exactly like my old Delta except mine doesn’t have the interesting pattern on the surfaces. Even the table is the same. Mine is still in original condition and has served me well for several years.
Is the scraping or dekeling something that was done during manufacturing or after?

View Richard Lee's profile

Richard Lee

199 posts in 978 days


#12 posted 11-14-2018 08:34 PM

Its done to keep the wood from “Sticking” to the smooth Cast Iron
Provides small pockets of air to make it slippery. Kinda like pebbling a curling rink.

View PPK's profile

PPK

1199 posts in 1012 days


#13 posted 11-15-2018 08:21 PM

No idea. But looks really neat!

-- Pete

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