Looking for information about a Delta 4" jointer

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Forum topic by thedog222 posted 04-09-2021 01:57 PM 635 views 0 times favorited 13 replies Add to Favorites Watch
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4 posts in 36 days

04-09-2021 01:57 PM

Topic tags/keywords: jointer

Hello all,
I’m new to this forum. I picked up a jointer recently and could use some help identifying it. I’d like to get it looking good at some point, but for now I’m more interested in getting everything working like it should.
I haven’t been able to find a serial or model number, but I haven’t yet had it fully disassembled. I’m including some pictures.

13 replies so far

View MrUnix's profile


8563 posts in 3283 days

#1 posted 04-09-2021 03:19 PM

Appears to be a very early model #300 or #301. The 300 was the first jointer Delta ever produced, and was made from 1929-1931, followed by the 301 after that. You can find a manual and parts diagram for it over at the Vintagemachinery site:


-- Brad in FL - In Dog I trust... everything else is questionable

View SMP's profile


3990 posts in 989 days

#2 posted 04-09-2021 03:27 PM

No idea, but love the sticker! Good luck!

View Aj2's profile


3843 posts in 2882 days

#3 posted 04-09-2021 05:39 PM

Cool jointer somewhat unmolested

-- Aj

View controlfreak's profile


2125 posts in 685 days

#4 posted 04-09-2021 05:54 PM

I didn’t they ever made a 4” so that tells you what I know about it. If it is anything like my Craftsman 6” I just went out and bought a set of knives so I was starting fresh. I made a jig out of a 123 block and a HF dial gauge (caliper?) so I could get the outfeed and the blade dead even. Its all I can fit in my little shop so it does what I need for now. I had picture but they are on a dead computer. Found it I have a picture if you scroll down a little.

View Phil32's profile


1392 posts in 987 days

#5 posted 04-09-2021 07:32 PM

Until recently I had the Rockwell version of this 4” jointer. It appears that yours is set up for too slow a cutter speed. On mine the motor pulley was twice the diameter of the driven pulley. Check the rpm of your motor and adjust the pulley sizes (& belt) to give you the proper cutter rpm – probably 4000 to 5000 rpm – but check the manual.

-- Phil Allin - There are woodworkers and people who collect woodworking tools. The woodworkers have a chair to sit on that they made.

View Aj2's profile


3843 posts in 2882 days

#6 posted 04-09-2021 08:56 PM

Phil makes a good point. About the motor speed it’s also a good idea to check the knives are correct and the gibs and bolts are in good shape. I seen some weird stuff people have done that had no business monkeying around with a vintage machine.
Also be sure nothing from China touches it. There no cure if it gets a virus at 90 years old.
Good Luck

-- Aj

View metolius's profile


391 posts in 1814 days

#7 posted 04-10-2021 12:06 AM

I have a Rockwell version of that. Replaced the motor and motor pulley on it a few years ago; and added a link belt. Still works well.

On my unit the motor pulley is 6.5in, the knife pulley is 2.75

I wonder what the previous owner was thinking about when adding an outlet to the stand.

-- derek / oregon

View thedog222's profile


4 posts in 36 days

#8 posted 04-10-2021 08:36 AM

Thanks everyone. I didn’t realize it was quite that old- I figured maybe mid-1940s.
I’ll check the pulley sizes vs the recommended sizes in the manual, but from running a few 2×4s through to test it out, it felt pretty slow. This is my first jointer so I don’t have anything to compare it to, but I had to move the wood through at barely a crawl to get a passable result.

View tvrgeek's profile


1869 posts in 2733 days

#9 posted 04-10-2021 10:59 AM

Does show nothing has changed in planers in almost 100 years, other than 4 inch is really small.

Looking at the picture, it looks like the sheaves are the same size, so that would mean really slow head speed. The motor looks like it is from the “70’s or newer, so it should have a plate with the RPM on it. I have a handy optical tach I use for unknowns.

View controlfreak's profile


2125 posts in 685 days

#10 posted 04-10-2021 11:02 AM

I wonder what the previous owner was thinking about when adding an outlet to the stand.

- metolius

If you think about that time period no home had enough outlets. I am sure that the owner was just trying to take advantage of blocking one outlet and creating two in its place.

View AMZ's profile


304 posts in 473 days

#11 posted 04-10-2021 11:05 AM

I have one of those, gave to my brother and he still has it. Bought used in late 80’s, no motor, but jointer had a sheave on it. Bought a motor from Delta for it (specifically for it) and IIRC, the motor came with a stepped sheave. Nice little jointer, great for edges, but not quite large enough for much face jointing.

View tvrgeek's profile


1869 posts in 2733 days

#12 posted 04-10-2021 11:12 AM

Search GOOGLE images and you can see a lot of pictures of your jointer. ( And the much larger motor sheave)

View aloysius's profile


14 posts in 2559 days

#13 posted 04-15-2021 02:21 PM

I just pulled an old Delta 4” out of my storage building. I bought it off eBay about 10 years ago and because of Covid and being at home for the past year, I have tackled all the old tools needing a rebuild.

I loved the original decal on the base and started looking into the history on and found that, like the one above (same decal), mine is a Model 300 produced only 1928 – 1929. It is equipped with bronze bushings and cotton packing which needs oiling thru a hole in the top of the bearing socket. I am now so enamored with the history of the machine, I am reluctant to do anything except clean it and sit it on a shelf in the shop . . I have another later model rebuilt 4” and 6” Delta jointer for use in the shop.

My issue now is whether or not (like all other rebuilds) to repaint this one? It appears that, under the buildup of oily sawdust, that the original color is a medium dark greenish hue and not the grey of later years?

Also, should this bronze bushing machine, as someone above mentioned, be configured to run at 4000 – 5000 rpm? I could see that with encased ball bearing but bushings? Just curious . . . comments anyone?

Dennis in Austin

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