Motor Speed reduction gearbox

[chucketn]

I’m looking for a speed reduction gearbox to reduce the rpm of a ¼ hp AC 1725 rpm motor to about 40 rpm. I have searched online and prices are amazing.
The application is a sand muller for my foundry. Anyone know a good source for said gearbox? Anyone have plans that a novice could follow to build one?
Chuck

 

[Philjoe5]

Chuck,
I bought a 5:1 gear reducer for my Grizzly 10x22 lathe over a year ago from these guys:

http://www.surpluscenter.com/Power-Transmission/Gear-Reducers-Gearboxes/

It cost me about $100. My lowest spindle speed is now 85 rpm, great for threading. I use the lathe frequently and the gearbox has been trouble free,

This 40:1 might be the ticket for $93

http://www.surpluscenter.com/40-1-R...T-OUTPUT/edp_no=36894/shop.axd/ProductDetails

Cheers,
Phil

 

[chucketn]

Chuck,
I bought a 5:1 gear reducer for my Grizzly 10x22 lathe over a year ago from these guys:

http://www.surpluscenter.com/Power-Transmission/Gear-Reducers-Gearboxes/

It cost me about $100. My lowest spindle speed is now 85 rpm, great for threading. I use the lathe frequently and the gearbox has been trouble free,

This 40:1 might be the ticket for $93

http://www.surpluscenter.com/40-1-R...T-OUTPUT/edp_no=36894/shop.axd/ProductDetails

Cheers,
Phil

Looks like I may have to bite the bullet and get one from there. Shipping isn't to bad.

Chuck

 

[Wizard69]

I’m looking for a speed reduction gearbox to reduce the rpm of a ¼ hp AC 1725 rpm motor to about 40 rpm. I have searched online and prices are amazing. The application is a sand muller for my foundry. Anyone know a good source for said gearbox? Anyone have plans that a novice could follow to build one? Chuck

Yeah good quality gear boxes are expensive. That is a bit over 40:1 reduction which isn't easy to do in a single stage except possibly with worm gear reduction. The problem I have with a sand muller is that I'm expecting some shock loading depending upon your muller design. This could lead to premature gear box failure.

I want to recommend a belt reduction drive due to the load you will be turning but 40:1 isn't exactly easy in a belt drive. Maybe what you need is a gear box with a final belt drive. The belt would help some with respect to any shock from the mulling action.

 

[OrangeAlpine]

How about a multispeed gearbox from a snowblower or lawn mower? Here is one that I have on my bandsaw. You should be able to get any low speed you want. You can vary input speed up to 2500, have the gear reduction plus up to 5 speeds plus reverse. Then, of course, there are possibilities offered by the #40 chain final drive.



Bill

 

[chucketn]

Thanks for the idea, Bill. Just posted a request on the local Freecycle lists for a broken riding mower. We'll see what we get.

Chuck

 

[DICKEYBIRD]

I've been on the lookout for a mower gearbox too OrangeAlpine. Have you ever counted turns & noted what the ratios are?

 

[MachineTom]

Chuck I have 1/2hp 80:1 reduction motor single phase 220, unused in the box. $50 but shipping could be $$ let me know

edit: wetght 32 lbs from 08721

 

[chucketn]

Thanks, Tom, but I don't have 220 in the shop,nor plans to get it.

 

[OrangeAlpine]

I've been on the lookout for a mower gearbox too OrangeAlpine. Have you ever counted turns & noted what the ratios are?

Dickybird, I have counted, but made no notes. If I remember correctly, the boxes have an internal chain drive which can have different ratios. Any gearset (or none) can be installed in any gear position. As you can see, that makes for a wide lattitude of ratios. The good news, you can get several gearboxes and create a unit to fit your needs. I think I used parts from three boxes to make mine.

Bill

 

[Draw-Tech]

Hi Orangealpine

I have been wanting to gear down one of my woodworking bandsaws, was going to add a jackshaft, transmission??? What a great idea, now I will have to find a 6 speed.

Jack
Draw-Tech
Hey Chuck

 

[OrangeAlpine]

This box (Tecumseh) has space for only 5 speeds , plus neutral and reverse. Neutral cannot hold a gearset and reverse is fixed as reverse. I could not find a 5 speed, had to combine "innards" to get a 5 speed with the proper ratios. I had a three speed box with the automotive "H" shift pattern. I also had a two and a four speed gearbox. Internally they were all the same gearbox. Very clever!

As near as I could tell, the 6 speed units are transaxles.

Bill