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Old 08-15-2010, 08:00 PM
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Default Powermatic 1150 Drill Press Rebuilt/Modification

A couple of weeks ago, I posted that i picked up a Powermatic model 1150 variable speed drill press, or pieces of a drill press. So I started to clean it up, and determine the course of action to make it run. I had a 3/4 hp, 1725 rpm motor off of a Jet drill press. After reading the manual, I found out the minimum speed was in the 450-500 rpm range, way too fast for what I need, so I decided to adapt a layshaft configuration to the DP that will offer 4 main speed ranges, with the variable speed part usable within those ranges. So I started to fab up the necessary pieces. Being real cheap, I dug thru all of the machine parts I have and found 2 matching 4 groove pulleys, but the were the wrong bore. I bored out the bores and pressed in an aluminum slug, then rebored the pulleys to the required 3/4" bore. The bearing should be here this week and this should be running. Then the variable speed controls, will have to be fabbed.


jack
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Old 08-15-2010, 08:24 PM
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Hmmm, so what are you shooting at for the bottom speed range, Jack?
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Old 08-15-2010, 08:46 PM
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Quote:
Originally Posted by cutter View Post
Hmmm, so what are you shooting at for the bottom speed range, Jack?

Cutter,

If my pondering and ciphering is correct (fingers times toes, divided by scars), it think it will be in the 150-175 rpm range, more usable for what I need. Thats if a man needs 6 drill presses.


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Old 08-15-2010, 11:26 PM
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Default Drill

Looks great I need to slow my drill down. Would like to see yours when you get it all done. I will check it out.
Vernon
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Old 08-15-2010, 11:35 PM
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the two big pulleys on the original drill are basically a cvt transmission right?

cool project
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Old 08-15-2010, 11:51 PM
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I don't know about your need for six, but this one will be nice. Jerry
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Old 08-16-2010, 06:02 AM
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Jack, the I by looking at the step pulleys you are using I think you low speed will be lower then you are estimating. I would guess the 100 to 125rpm range.
I looked at a industrial radial arm drill press last week on my way home from work, I think the lowest speed on that was 25rpm, I might buy it from the guy when the new shop is up, as it is too big for my present shop.
Interesting project, keep the photos coming.
Dan.
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Old 08-16-2010, 06:18 AM
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Another obvious question.....

But is there any such thing as too slow?
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Old 08-16-2010, 09:12 AM
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Quote:
Originally Posted by Lu47Dan View Post
I looked at a industrial radial arm drill press last week on my way home from work, I think the lowest speed on that was 25rpm
Dan.
Wow! I wonder how big a drill bit that thing will take?

Nice Project, Jack!


DrBob
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Old 08-16-2010, 10:10 AM
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Quote:
Originally Posted by DrBob View Post
Wow! I wonder how big a drill bit that thing will take?

Nice Project, Jack!


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DrBob, it was a Fosdick, I think he has up to a 3" drill bit for it, he moved it from his grandfathers shop and is thinking of selling it next summer. I worked with him on my last job and he asked me if I would be interested in it once he has finished the project he is working on. I would have to get a bigger trailer to haul it home on as he says it weighs over 5000lbs. Not necessarily something I would use everyday but handy to have when you need it.
Dan
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