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Dunlap 103.23622 Drill Press #1: Introduction and Planning

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Blog entry by sansoo22 posted 07-15-2021 12:59 AM 871 reads 0 times favorited 3 comments Add to Favorites Watch
no previous part Part 1 of Dunlap 103.23622 Drill Press series Part 2: Addressing the motor pulley and shaft »

I recently purchased a Dunlap 103.23622 bench top drill press at an estate sale for $40. I thought it was such a nice deal that I should throw 4 x that amount in parts at it and make it look brand new.

Also note…I’ve never owned a drill press so this should be a fun time learning how they work as I go.

The primary focus of this blog is to document every last part number of every last replacement part I order and put on this thing. I have seen quite a few forum posts about the Dunlap and comparable Craftsman drill presses but no one has done a full write up of everything they ordered for it. One of the entries in this series will be totally boring as hell with just a list of parts and a picture of them…but hopefully someone might find it useful when doing a Google search about this model or a similar Craftsman model.

A little history:
From as much info as I can gather this Dunlap model was built by King Sealy sometime around 1950. Its not quite as nice as the Craftsman 100/150 models from around the same time frame as it uses an oil embedded bronze bushing for the spindle instead of a couple bearings. Although I have also found a few Craftsman with the same bronze bushing in the head. Back then Craftsman seems to have had multiple versions of the same tool. Why I don’t know. Dunlap was supposed to be their downline so why have the same exact thing painted battleship grey with a Craftsman badge.

Enough chatter lets see the ugly bastard
Some of the tear down has been done before I decided to do this write up so forgive me if some of the images are missing parts. This thing was complete and running when I got it.


Table isn’t in bad shape at all. Center hole has some wear from mishaps but I’ve seen worse.


Bottom table/pedestal is painted and I can’t decide if I will re-paint it or leave it bare cast iron. They seem to get pretty beat up from setting crap there so I think I might opt for bare cast iron.


I will even be repainting the motor housing in that same color scheme. EBay was kind enough to have that Craftsman decal for sale so will even replace that.


The previous owner apparently didn’t get the memo that this was a bench top drill press. Most of these come with a 1/3rd HP motor. He opted for the 1/2 HP typically found on the floor standing versions but I’m not complaining. It still runs nice and smooth.


Previous owner was a wood worker if you can’t tell.


Inside of the motor is just as dusty and that shaft has seen better days but I have a plan to get a better fit for the pulley.

Next steps
This is the part I’m not quite sure how to proceed yet. The main body of the drill press is to bulky to put in my blasting cabinet. I’m considering a cheap Harbor Freight gravity fed gun and some coal slag to blast it outside. The main bushing is getting replaced and I will do that after its been painted to avoid any issues with overspray. I’m open to suggestions on that part.

The quill and pinion assembly have already been removed. I have a couple bushings on order for that and will go over its cleaning and reassembly in the next entry. I’m still restoring planes as well and have a customer about ready to send another batch so this is a side project and may take some time to get fully documented. However I am taking an abundance of photos along the way to avoid missing any important steps.

And that’s a wrap for this entry. Thanks for stopping by.



3 comments so far

View HokieKen's profile

HokieKen

18417 posts in 2297 days


#1 posted 07-15-2021 03:36 PM

When you say the “main” bushing, I assume you’re referring to the headstock bushing? Then best I can tell you have another piece that rides in the the headstock bushing and is keyed to the drive pulley and the spindle moves linearly inside that with a spline fit to transfer rotation?

If I have all that right, the headstock bushing just bears rotation, no axial translation? I’m also guessing that bushing probably has some oil grooves machined into it based on the hole drilled in the head casting. I’d make sure the replacement has the same.

Why are you replacing it? If it’s because the internal finish feels rough, that may not be wear, it may be finished that way for oil retention. If it’s due to slop with the piece that rides in there though, then go for it. Hopefully you can find a suitable replacement off the shelf. If not, let me know.

So I’m guessing you were able to find replacements for the bearings in the quill based on your post. That’s fantastic :-) Should be a fun restore and a damn fine tool on the other end!

When I restored my drill press several years ago, I just stripped the old paint with a stiff wire brush in an angle grinder. I think you’ll find that method much more expedient than sandblasting. Especially with a gravity feed gun you constantly have to refill ;-)

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

View sansoo22's profile

sansoo22

1747 posts in 813 days


#2 posted 07-15-2021 10:19 PM

Did some further research last night and near as anyone can tell these originally came with oil embedded bushings and that hole behind the bushing is for keeping it lubricated. The one in my machine has been bone dry for years with visible slop between it and the spindle sleeve so its going to come out. I think a socket, some washers + nuts, all thread, and a small piece of pipe to receive the bushing will pull it right out. At least that’s been the consensus from a few different postings about these across the internet.

The top of the bushing does take some axial load but its just the weight of the top pulley. There is an odd shaped thrust washer…I think thats the term…that is pressed into the bottom of the pulley.

According to a post from Hobby Machinist there isn’t enough room for a standard sized flanged bushing to ride on that oddly shaped thrust washer. The solutions, neither of which I have the skill or equipment to do, are mill your own bushing with a smaller flange or mill the pulley to fit a standard round thrust washer. That Hobby Machinist user chose to mill the base of the pulley since they are a machinist and can do those things.

To my surprise McMaster has bushings of the right size for the headstock and the quill assembly. I have an oil embedded bushing on order for the headstock and a couple different types for the quill assembly. I can’t tell if the bushings in the quill assembly are oil embedded or not.

Here is a close up of one if anyone wants to take a guess

View HokieKen's profile

HokieKen

18417 posts in 2297 days


#3 posted 07-15-2021 11:11 PM

I can’t see a good reason to not use oil impregnated bearings in the quill. There is no oiler to constantly lube them and there are no oil seals to keep oil or grease contained in the quill.

As best I understand it, bronze bearings that aren’t oil impregnated are more intended for low speed, high load applications, like a lathe spindle. In those applications you have to keep them lubed with oil or grease but you also have to keep them clean. So a drill press would be a poor application for those. It is low speed but it’s also virtually zero lateral loading. So longer wearing isn’t as critical as cooler running and lower friction.

Sintered bronze is oil impregnated and has lots of microscopic nooks and crannies where lube can be retained. I believe they are usually machined to a tighter radial fit because you don’t have to leave clearance for oil or grease to live between the components. I should google this instead of going off memory but I’m on my phone so I ain’t gonna ;-)

So I see no disadvantage to using impregnated bronze bushings in your quill and the lack of oil seals or any way to easily keep the continually oiled leads me to believe that was the original design intent.

I’d be happy to mill your headstock bearing flange down to fit the pulley or bore out the pulley, whichever you decide on. I’ve got some plane parts to settle up for ;-)

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

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