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  #1  
Old 05-11-2017, 09:20 PM
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Default Mill Transmission For The Rockwell Mill

I have decided at this point, to run the new Rockwell mill, with a single phase motor. Whether its going to be 120 vac or 240 vac, I'm uncertain, the 3/4 hp motor I have can go either way. With the 1725 rpm of the motor, I'll end up with 6 speeds, 370 rpm in low and 6300 rpm in high.

I've decided to build a "transmission", like I did for the Jet mill, adding a 4 step layshaft between the mill head and the motor. I'm building it to be a cartridge, to allow the mill to be returned to original configuration, within about 15 minutes, drilling no holes, using the manufacturer's original holes. Also using the original drive sheave.

So today I went to Graingers, for (2) sheaves (pulleys) and (2) 5/8" plate bearings. Then to the local machine shop supplier, for 5 feet of 5/8" ground and polished shafting. Then to the metal suppler for some tubing, then to the industrial supplier for some nuts and bolts.

I cut out (2) 10-1/2" discs, one of of 1/4" plate, and one out of 3/8" plate, then trued them up on the lathe. I laid out the bolt placement and drilled the holes on the 1/4" plate. Transferred the hole to the 3/8" plate, then threading the required holes in the 3/8" plate. Took a piece of the 5/8" shafting and set up the Jet mill, to cut a 3/16" keyway.

The cut up some 1/4" pipe nipples, to 3" long, the bored them out to 25/64", so some 3/8"-16 B-7 allthread would pass though to make the spacers.

Then assembled the "transmission" set, placed it on the mill and set the correct sheave height, so the belt was aligned properly. Set the new drive sheave height and tightened the bearing collars and shaft collars.

So today, I used the lathe, the Jet mill, the Jet drill press with the tapping head, the Franken-Drill, the belt grinder and finally the new saw. The shop was quite a mess.

Here are a few pictures of the work so far, next up is the motor mounting brackets and the wiring.
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Last edited by platypus20; 05-11-2017 at 09:38 PM.
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  #2  
Old 05-11-2017, 09:43 PM
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That looks great!!! How is the belt adjusted?
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  #3  
Old 05-12-2017, 03:58 AM
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What was there before hand?

A shaft sticking up, or a hole in the stepped pulley below?

Looks a solid setup either way
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Old 05-12-2017, 07:46 AM
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Working the rpm numbers this morning, the original spindle rpms with a 1725 rpm motor, were a low of 370 rpm to a high of 6300 rpms, I have some options, each give 24 different speeds.


Option #1

low of 185 rpms, to a high of 12,600 rpms, with average steps of 230 rpms between speeds

0ption #2

low of 111 rpms, to a high of 10,080 rpms, with average steps of 150 rpms between speeds

Option #3

low of 111 rpms, to a high of 8190 rpms, with average steps of 78 rpms between speeds
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Last edited by platypus20; 05-12-2017 at 07:54 AM.
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  #5  
Old 05-12-2017, 08:27 AM
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#3 is most practical, I think
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Old 05-12-2017, 08:53 AM
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Quote:
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#3 is most practical, I think
I agree that #3 is the way to go.
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Old 05-12-2017, 10:12 AM
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Thinking about the Son of Frankenmill "Rocky" and wondering if there is any mill in that magic garage that has not been modified....and by a self confessed tool abuser at that.

And then I looked in the mirror.....
My mill has been converted to 3 phase, has had dro scales added, link belt added...well I am guilty too. Maybe it is a 'thing' to tweak a mill to your own personal needs.
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Old 05-12-2017, 11:09 AM
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You mod your your mill your way and I mod mine my way. I have a Bridgeport "M" head driven with a John Deere mower spindle and a washing machine motor. It does the job and it was what I had on hand.
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Old 05-12-2017, 05:53 PM
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Quote:
Originally Posted by Norm W View Post
You mod your your mill your way and I mod mine my way. I have a Bridgeport "M" head driven with a John Deere mower spindle and a washing machine motor. It does the job and it was what I had on hand.
Is that one of the Maytag gas engines?
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Old 05-12-2017, 07:34 PM
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Unfortunately no, it was a Kenmore 2 speed.
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