Jet 1236 upgrade slow progress.??? PIC

Re: Jet 1236 upgrade slow progress.??? PIC

Ron in Drums PA

>Can't you use the reeves drive from the 1236?

Couple of reasons not to reuse the Reeves Drive

Dave Smith, Longview, WA

>Hi Ron,

Sorry it took so long to answer your question. I had to sort out your question from all the responses I received.

The Reeves Drive is one of the reasons I am going to a VFD. I am tired of the drive sticking and slipping.

The reeves motor pulley does not fit the motor shaft.

The gears for the speed selector are also shot. I'll bet a lot of people have that problem and don't know it. FYI - The two shafts for the speed selector can be rotated 180 degrees when the teeth get warn.

I also want to turn at a much lower speed that the Reeves Drive allows.

I can't afford to spend $2,000 or more to get a better lathe.

Thanks for your question.

Dave Smith

Just a little miffed in Longview, WA.

Re: Couple of reasons not to reuse the Reeves Driv

John K Jordan

>>The motor has 4 steps on the pulley. As best as

>I can measure the diameter of the steps are; 1

>3/16"; 2 1/4"; 3 1/32"; 3 15/16".

Dave,

I'm certainly no engineer, but do you need help in determining the speed from pulley sizes? The relationship is a simple ratio, the ratio of the speeds is proportional to the inverse of the ratio of the diameters (or radii, etc) of the pulleys. For example, to get the spindle speed multiply the speed of the motor by the ratio of the diameter of the drive pulley to the diameter of the spindle pulley. You can rearrange the formula to solve for the spindle diameter given the speed - do you need the forumlas?

You can work backwards from the maximum and minimum speeds you want and calculate the exact pulley sizes. However, I'd be careful in pulley selection to keep the distance between the motor shaft and the spindle shaft the same when changing speeds. This will limit the sizes you can use. Unfortunately, I don't know a way to buy a 4-step pulley with arbitrary sizes for each step. You could easily have one machined to exact specs.

If doing this, I would write an Excel spreadsheet and either play with the numbers or

I think a guy I know who builds things like this just buys his pulleys in pairs. That way, the distance between the shafts automatically remains equal. However, if you simply mirror your existing pulley the speed range would go from nearly 600 to over 5000 rpm which doesn't seem ideal. The easiest thing might be to replace both pulleys. Can you get a set made for driving a wood lathe with 1750 rpm motor?

Sorry, I'm in a bit of a rush and can't recheck what I said above or figure out more at the moment, but I could look at this later if necessary.

JKJ in East TN

Re: Jet 1236 upgrade slow progress.??? PIC

Pete in Holland, MI

>Dave -

I feel your pain in the OEM drive in the Jet 1236. Turning bowls beyond 9" in diameter, the belt starts to slip. The original belt that came with my lathe was a standard "wrapped" belt, where the fabric of the belt is wrapped around the core. Seems in other Reeves drive operations (drill presses & snowmobiles), the belt is a "cut" belt with a lot of rubber showing on the sides. Would think this would give better traction. Am going to try this next time around.

Your step pulleys you're looking for, especially on the spindle, are going to be tough to find. Most store-bought step pulleys are set up for shafts no more than 3/4". Might check with a power transmission supply house to see if you can get individual hub-less steel pulleys, and affix a group of 3 or 4 to the shafts of the motor & spindle. Diameters aren't critical to the speeds attained, ratios between the driver & driven pulleys are. A 2" pulley driving a 4" pulley will drive the spindle shaft at half the driven pulley. Same holds true using a 12" into a 24" pulley.

Also, trying to drive a lot of horse power from or into a very small pulley requires good & tight belts. Increasing the minimum pulley diameters gives more belt contact with the pulley.

Good luck. Keep us posted on your results !

Re: Jet 1236 upgrade slow progress.??? PIC

Hawaii Turner

>Dave,

Before worrying about pulley sizes, have you checked the shaft size on the lathe? I suspect that it might be metric, and my experience is that you will have a problem finding a pulley to fit unless its off of another imported lathe. A possibility is also to bore out a smaller hole pulley to fit. Do you have an accurate way of measuring the shaft? If so, what is its size?

Aloha, Doug

Lathe shaft size is 25mm. *LINK*

Dave Smith, Longview, WA

>Hi Doug,

If I lived on the Big Island I would have a job for you. I found a step pulley at Surplus Center that should work. I will probably order it and have it bored out to 25mm and a key slot cut. I looked up the bearing that is on the lathe shaft and the bore is 25mm. I don't think I can get any more accurate than that. I attached the link to the pulley. Tell me what you think.

Dave Smith

Counting the days, until I go to the land of fresh strawberry papaya, in Longview, WA.


Step Pulley