You really need to provide much more detail of the parts that you seek.

For instance, where is the belt line relative to the shoulder or taper on which the pulley is mounted.

What sort of 5/8" wide belt? Flat, Vee? If so what section?

Otherwise no one is quite sure how long you want your piece of string!

Providing an accurate model of your engine mounts is a good idea.

But of what do you want them made? Rubber, (Any idea of the Shore hardness? ) Nylon? Steel? Aluminium?

A few answers might elicit a few responses.

Howard

Many of us may be able to help you but we need ALL the details ! Noel.

Cast iron ? What about re machining a polly V pulley ? There not dear and readily available. JUST A THOUGHT ! Noel.

5 mins

Tony

90 degrees is a very strange profile for a Vee belt.

The standard for many years has been 40 degrees.

And turning such a pulley will NOT be a 5 minute job, on a manually operated machine, by ANY stretch of the imagination . Possibly not even on a CNC machine programmed and tooled for high volume manufacture.

It will involve at least two set ups, and that is after making an arbor to carry it for machining. (Which will take a lot more than 5 minutes, for starters )

A commercial machine shop, if they took on the job, would probably charge you at least an hour for labour, plus overheads. So, being realistic, neither a quick, nor cheap, job.

How is the pulley located on the rear wheel hub?

Does it just rely on the friction created by clamping against a flange, or a keyway / splines? 2 -3 hp will need a fair clamping load to prevent slipping. And the material of the pulley will affect the clamp load required.

And a piece of steel or cast iron (Assuming those would be the most suitable materials ) is going to be 170 mm diameter as raw material And a 16 mm slice is going to be literally cutting it fine to clean up.

You need to carefully check the driving pulley profile, and ensure that the belt line will be correct, Otherwise you are spend a lot of time renewing belts, and possibly even bearings!

Howard

If it only takes 5 minutes I'm sure you can find the time to learn metal turning, that should take you all of 10 minutes.

Ian

Check your INBOX on the top menu bar.

Emgee

The more detail that you can provide, the less will be the trial and error. involved.

Making steel or cast iron items of that diameter, and then scrapping them because they do not do what is required will be an expensive hobby.

At least, you need to define the groove more precisely, and the tolerance on the bore.

Incorrect or vague details will only result in some kind soul making an item that is at best, not fit for purpose..

A B section belt with a 40 degree angle won't function well in a 90 degree groove

An open limit, possibly drilled 3/4, bore will be a loose fit on a shaft that is 0.750 + / – O.001", and will wobble or run eccentric, neither of which will be good for the belt of the bearings at each end of the drive train.

You need to measure the shaft diameter accurately, not with a tape measure or 6" rule.

As in "four basic machine operations" I would take six, or seven, plus making an arbor, if you want reasonable accuracy.

Do the photographs of the original show any fixing or lightening holes? If so, more operations required !

I may be wrong in that, but over 40 years in manufacturing industry makes me think that way.

Hopefully, some kind soul will take pity, and close enough to you that you can watch and find out what is entailed in making your pulley; when it becomes clear exactly what is required.

Face to face to contact and accurate measurements are what is needed, before cutting metal.

Based on the information provided so far, it can be made, but you will probably not be satisfied with what you get.

I certainly wouldn't be!

Would you like me to set out the machining operations, and the order in which I would do them, for you?

That would give you a better understanding of what is involved. If so PM me.

Howard

If you want an idea on what's involved machining a belt pulley, this 3 part I think it was, series of videos will give you an idea, bear in mind the guy doing the machining is also very experienced, you only have to browse this forum to find out many people can't do 'simple' operations like parting off.

Edited By Pete. on 04/11/2021 00:23:21

Edited By Pete. on 04/11/2021 00:24:26