old craftsman lathe

I have an old craftsman lathe with a missmatched motor. The motor seems to be turning too fast,I looked up the rpm's for the lathe and they were between 200 and 400. The motor is spinning at 11oo rpm,s. I tried it on all the pullys,but this didnt help. I have been resding some of the letters here, and see that others are uesing motors that spin over

1000rpm's with no proublems. Doe's anyone have any ideas what I am doing wrong?
Reply to
dbke99
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a wood lathe should have a speed range approx 200-2500. a motor that turns at 1000-1500 say should be able to get the lathe turning with a suitable range of pulleys. a bit more info may be helpful .. does your motor have a set of pulleys on it and what diameter are they ? does the headstock of your lathe have a set of pulleys ? what diameter ? do you wish to have one speed or several speeds to your lathe ? do you move the motor or the belts to change speeds ?

Reply to
geoff_tulip

This is a difficult question without more information. You say that they motor is missmatched, but you don't say how.

If your motor spins 1100 rpms, that may or may not be a problem. You should certainly be able to slow an old Craftsman lathe down using a motor as slow as that. More important than that though, is the pulley arrangement on the actual motor shaft. If it is not the original motor, or at least not the original pulley with four (?) rings of different sizes on it, that may be where you are losing most of your speed control.

If the original motor has been replaced with a washing machine motor, or any other motor that was a single speed machine it may only have a one groove pulley, and you are only changing the speed nominally by changing the belt position on the lathe itself.

You need to post a few more details.

Robert

Reply to
nailshooter41

Of course, you can use the pulley ratio to determine your final rpm by multiplying it by the nameplate speed of the motor. If you have an 1100 rpm motor, you have the low side of a standard washing machine dual speed motor. High side is 1725 , assuming 60Hz.

Thus, if you have a 1" diameter pulley (sheave) on the motor, and a 3" on the lathe shaft, your speed should be close to .33 (1/3) x1100 = 360.

That's my low speed on my 3000. High speed is 680. Other speeds available, but I don't use 'em, finding the two useful for work from 1/2" diameter to

15 3/4.
Reply to
George

Hi, what's your name

Like the others are already saying, we need more info if we are to be able to give some advice.

You have a very special motor if it runs 1000 rpm, and yes they are around, big and heavy for the extra windings in the one or two cases I remember.

Normal common speeds for 50 cycle ac are 1440 and 28880 rpm and for 60 cycle ac 1725 and 3450 rpm.

So with a 1000 rpm motor you should be able to go slower than normal, as most turners wish they could.

Now the question is, what do you have, do you have 2 4 gang pulleys or

2 3 gang pulleys, or only one on the lathe and a single pulley on your motor ??????

And what are their sizes, smallest to biggest, so get back out there and start measuring and then report back, so we have something to go on.

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Have fun and take care Leo Van Der Loo

Reply to
l.vanderloo

Some lathes spin too fast as designed.

Reply to
Derek Hartzell

wrote: (clip) I looked up the rpm's for the lathe and they were between 200 and 400. The motor is spinning at 11oo rpm,s. (clip) ^^^^^^^^^^^^^^^^^ All these figures seem wrong. Lathes always have a speed range, not a rating, and no old Craftsman lathe would have speeds that low. It is rare to run across an AC motor that turns that slow.

Reply to
Leo Lichtman

Have a friend who bought a used drill press. The pulleys were installed wrong so no matter which way you placed the belt it still turned at the same speed.

Lenny

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Reply to
Lenny

"Lenny" wrote: Have a friend who bought a used drill press. The pulleys were installed wrong so no matter which way you placed the belt it still turned at the same speed. ^^^^^^^^^^^^^^^^^ And also very annoying: the necessary belt length was different for every "speed."

Reply to
Leo Lichtman

Most old lathes, especially of the Craftsman variety, were intended primarily for spindle turning. Spindle lathes normally have a higher speed range than lathes that are used for turning bowls and other larger diameter work. By using a stepped pulley on the motor and another on the lathe, you should be able to achieve a range of speeds in the 500 to 2500 range which will be fine for spindle or other small diameter work. Most 1/3 and 1/2 HP motors come in two varieties, 1750 RPM and 3450 RPM. The slower motor is more suitable for lathes. Since you say your motors turns at about 1100 RPM, I think you should investigate the pulley arrangement as a way of controlling the lathe speed. Good Luck.

Reply to
Barry N. Turner

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