Sailrite Ultrafeed low speed cog mod

[DaveAB]

Why can't we just switch the pinion gear on the standard motor for a smaller one? We can! I talked to sailrite the v1 and v2 ultrafeed's came with 11 tooth cog the v3 had a 10 tooth (you can still order this on their site) they couldn't source anything with less teeth. I can't find one to buy either.

 

You can print one though! here is an 8 tooth version, this will improve low end speed at the expense of the high speed.

https://www.thingiverse.com/thing:5887617

[kgg]

8 hours ago, DaveAB said:

Why can't we just switch the pinion gear on the standard motor for a smaller one?

Yes you can reduce the size of the motor pulley but the improved gain may not be worth the trouble. You may be better to change the intermediate speed reducer configuration. If you know the size of the existing pulley's you could do the calculations fairly easily by going to the Pulley Calculator online. Go down to the Multiple Pulley Sets - RPM Reduction ( https://www.blocklayer.com/pulley-belteng ) section and enter your values. Base on the results you can determine is the slight gain in speed reduction and increased torque worth the effort.

kgg

 

[DaveAB]

1 hour ago, kgg said:

Yes you can reduce the size of the motor pulley but the improved gain may not be worth the trouble. You may be better to change the intermediate speed reducer configuration. If you know the size of the existing pulley's you could do the calculations fairly easily by going to the Pulley Calculator online. Go down to the Multiple Pulley Sets - RPM Reduction ( https://www.blocklayer.com/pulley-belteng ) section and enter your values. Base on the results you can determine is the slight gain in speed reduction and increased torque worth the effort.

 

ahh cool site, I will play around with it.    I was thinking about changing the intermediate speed reducer but my cad skills were non existent until yesterday. 

Edited March 3, 2023 by DaveAB

[DonInReno]

What diameter is the motor shaft?

[DaveAB]

8mm

[DonInReno]

In aluminum that size of pulley is readily available.

I search eBay with “10 tooth xl timing pulley”

The BF style has a hub on the side, while the AF style has straight sides.

The XL size timing belts come in different widths, and with or without the metal lips on the sides to keep the belt from working off the pulley.

[DaveAB]

Sailrite actually sell a 10tooth version 

https://www.sailrite.com/10-Tooth-Cogged-Motor-Pulley-for-Ultrafeed

The 3d printed one is 8 tooth so  20% smaller.  I can't find an aluminium one. 

[DaveAB]

Here is a photo of all 3 gears  11, 10 and 8

Edited March 3, 2023 by DaveAB

[kgg]

13 minutes ago, DaveAB said:

Here is a photo of all 3 gears  11, 10 and 8

My opinion is that if you use the same belt to go from 10 to 11 or vise versa there should probably be no problem but going down to the 8 may cause belt ride over / skipping etc do to the spacing / sizing of the lugs on the belt. Clogged or lugged belts are great as there isn't any slippage but the downside it has to be matched properly to the teeth of the gear or pulley.

kgg

[DaveAB]

2 minutes ago, kgg said:

My opinion is that if you use the same belt to go from 10 to 11 or vise versa there should probably be no problem but going down to the 8 may cause belt ride over / skipping etc do to the spacing / sizing of the lugs on the belt. Clogged or lugged belts are great as there isn't any slippage but the downside it has to be matched properly to the teeth of the gear or pulley.

kgg

I have been testing it and have experienced no problems with skipping. The teeth are pretty beefy, they are designed to match the belt exactly.  

Using the website from DonInReno

Stock 11mm pully gives you a gear ratio of: 1 : 2.9

3D printed 7mm pully gives you a gear ratio of: 1 : 3.8

[DonInReno]

It would be really cool to print out a dual pulley with higher ratio to replace the factory speed reducer.