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27th December 2013, 07:48 PM #1
New Member
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Treadmill donkey on a Nuttall belt driven spindle?
Hi folks!
Could i please anybodies opinion on tread mill spindle conversions?
The machine in question is a 1940 Nuttall 6 1/2.
The max spindle rpm stated is 750 rpm.
So, i'm thinking, add 10% for emergencies and belt ratio to suit below the motors 4000 rpm 2 1/2 hp.
So, 825 rpm at spindle with the motor doing about 75 to 80 percent steam.
Should be all ok huh?
Cheers, drive safe on new years all.
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28th December 2013, 12:17 AM #2
Blacksmith, Cabinetmaker, Machinist, Messmaker
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Hi Fuglee, Welcome to the forum.
Have you read this thread? https://www.woodworkforums.com/f65/ma...ersion-159263/
It gets a bit OT and long winded in places (i was in hospital with meningitis for some of it) but it shows what can be done, what is needed and what not to do.....
The crux of it is they need to be kept cool, specially if your going to be braking the motor and turning on/off a lot. If your Nuttall has a clutch/brake then the overheating will not be as much of a problem. The top speed should be kept well under the top rated speed of the motor, i think the figure is in that thread somewhere, if not Rob (Nearnexus) may know it off the top of his head.
What sort of bearings does the Nuttall have? You may want to up the top speed somewhat for small dia work in steel and work in ally. The Mars with its plain bronze bearings and ball thrust race has run fine up at 2500rpm (yeah a little excessive, i know) with no overheating problems. You just need to keep the oil up to the bearings.
Cheers,
Ewan
Oh, and any pics of your lathe? We like pics
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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28th December 2013, 04:50 AM #3
Golden Member
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I second Ewan's suggestion about reading https://www.woodworkforums.com/f65/ma...ersion-159263/ I found it very interesting.
Originally Posted by Ueee
Hi Fuglee, Welcome to the forum.
Have you read this thread? https://www.woodworkforums.com/f65/ma...ersion-159263/
It gets a bit OT and long winded in places (i was in hospital with meningitis for some of it) but it shows what can be done, what is needed and what not to do.....
The crux of it is they need to be kept cool, specially if your going to be braking the motor and turning on/off a lot. If your Nuttall has a clutch/brake then the overheating will not be as much of a problem. The top speed should be kept well under the top rated speed of the motor, i think the figure is in that thread somewhere, if not Rob (Nearnexus) may know it off the top of his head.
What sort of bearings does the Nuttall have? You may want to up the top speed somewhat for small dia work in steel and work in ally. The Mars with its plain bronze bearings and ball thrust race has run fine up at 2500rpm (yeah a little excessive, i know) with no overheating problems. You just need to keep the oil up to the bearings.
Cheers,
Ewan
Oh, and any pics of your lathe? We like picsBest Regards:
BaronJ.
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