they are heavy suckers, aren't they?I think I have that exact motor sitting out in the garage .
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1946 Delta 17" drill press repulsion-induction motor bearings
- Thread starter yota
- Start date
- Joined
- Jan 31, 2016
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- 13,241
They sure are .
I scrapped the drill press years ago when I was machine heavy , it looked identical to yours . 
wow, googling 87504 bearings last night. quality bearings have gone way up since the last time I bought them. looked at ebay, amazon and just googled all over. pretty much looking at 50 bucks for 2 quality bearings shipped. lots of no names out there for 8 bucks a piece. ended up buying a whole box of new old stock Japanese 87504's. if anyone needs bearings for their old Delta motor let me know! 15.00 each plus shipping.
- Joined
- Sep 10, 2020
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- 50
That is about the nicest Delta dp 600 I've seen, next to my own. Mine dates to 1942 and the motor has the same shape but I don't remember it taking the 87504 bearings. On the spindle bearings, I subbed the lower one for a 5204 series double angular contact bearing and shortened the spacer to compensate for the extra thickness. Mine dating a little older, has the pressed steel pulley guard. When changing speeds and that thing would give way and snap on the fingers is a pain. I often think about getting a cast iron front guard like yours and leave the rear part open. I also have a VFD running the 3 phase motor. I also look forward to implementing a foot feed pedal to use with the just visible feed lever on the right side of the head. Oh, I also shortened the 3 handles as one was badly bent and they seemed a bit long anyway.
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- Sep 10, 2020
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My DP600 has the low speed pulleys. It originally came with 1 low and 1 high, so I had to do some trading. So far, I haven't lacked torque for low speed metal drilling with the VFD at 30+ Hz.
I'm not aware of a 3-pulley setup available for the 17". There was a 3-pulley setup available for the 14" 220. It is a simple plug that fitted the column with a eccentric shaft for the idler pulley. When the 2 belts were in place, pulling the motor back would put equal tension on the eccentric shaft. There is a thread here or on Practical Machinist, showing a shop made version of this idea. The short video was most impressive, but there could be a fiddle factor on getting the right size idler pulley where the circumference was close to the same for all pulley combos, size of belt to optimize eccentric shaft movement, and possible idler pulley interference with the head casting backbone that holds the upper spline and spindle pulley.
Here is the thread. They did not have the idler shaft eccentric, so there is no adjustment between spindle and idler pulleys.
www.hobby-machinist.com
I'm not aware of a 3-pulley setup available for the 17". There was a 3-pulley setup available for the 14" 220. It is a simple plug that fitted the column with a eccentric shaft for the idler pulley. When the 2 belts were in place, pulling the motor back would put equal tension on the eccentric shaft. There is a thread here or on Practical Machinist, showing a shop made version of this idea. The short video was most impressive, but there could be a fiddle factor on getting the right size idler pulley where the circumference was close to the same for all pulley combos, size of belt to optimize eccentric shaft movement, and possible idler pulley interference with the head casting backbone that holds the upper spline and spindle pulley.
Here is the thread. They did not have the idler shaft eccentric, so there is no adjustment between spindle and idler pulleys.
Delta Dp-600 Drill Press Restoration (photo Intensive)
Nice work. This caught my I as I also recently acquired one. Mine had the long #2 MT spindle and was 3 ph. All I have in it is a VFD and keyed chuck and like it a lot. My table is a little bit out front to back and I was wondering if you noticed any way to adjust this when you had yours...
www.hobby-machinist.com
I've been working on that for the last 2 days, here and there. bought 2 belts about 30 minutes ago, one needs to be longer so will take it back in the morning. I have the low-speed pulleys also but want even slower speeds. the curved cast iron pylon that stabilizes the front pulley/Quill is a problem, the belt from the front pulley to the center pulley wants to rub on it when it's on the smallest sheave of the center pulley. but even if I can only use the upper 2 or 3 it will get me where I want to be. will know tomorrow. I did install a bronze grommet where the center pulley pivots in my aluminum plug.
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- Sep 10, 2020
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OK! You're doing it. A video would be nice.
When I was researching this topic, I found an offset idler pulley on the Grizzly drill press parts site for $20 or so. As I said, I wanted to see what the VFD could do and I also just finished a Bridgeport rebuild for any heavy drilling.
When I was researching this topic, I found an offset idler pulley on the Grizzly drill press parts site for $20 or so. As I said, I wanted to see what the VFD could do and I also just finished a Bridgeport rebuild for any heavy drilling.
