Servo motor speed limiter

[Wizcrafts]

20 minutes ago, JeffHami said:

Is there a local store that might sell belts like Ace Hardware or a mower shop?

Unlikely, but possible. These 3/8" belts are mostly used on industrial sewing machines.

[mikesc]

In France you can get the right size belts from mower shops, so it is worth a try where you are..if you are using a smaller pulley, look for belts with teeth, they are able to get around the smaller diameter pulley better.

[JeffHami]

I've done a web search and found them at Tractor Supply https://www.tractorsupply.com/tsc/search/3L Type V-Belt and Granger Supply https://www.grainger.com/category/v-belts/power-transmission-belts/power-transmission/ecatalog/N-cc2Z1yzazhm  If they don't work I'll try one of the sewing machine suppliers. 

[JeffHami]

OK one last question on this subject. The new Techsew pulley will be in Thursday and I'll have to move the motor and mount the new pulley. Does anybody have any advice on what type of screws/bolts to use in the wood for mounting the motor and pulley?

[brmax]

I suspect some lag bolts or screws in 1/4” would come with the reduction pulley assembly. Thats what i would use in this case anyhow. I would carefully pilot drill a smaller diameter for the three mount holes. 

I believe in some historical post on the site here there is mention to have the reduction pulley center clearly mounted behind the sew machines, pulley center. 

On the motor if relocation towards rear is required I would still try and maintain the carriage bolts typically used. If needed,  I have consistantly used fiberglass resin to repair holes and wood surfaces. Allthough this resin repair is only for non oil soaked wood.  

Good day

Floyd

ps: i would wait or look in the included items before buying anything. There may be better attachment fastening hardware included. 

Edited January 8, 2018 by brmax

[brmax]

You might find some threaded inserts for wood helpful. These types offered in the link are factory installed on my Cobra table, mounting the same part. 

  https://www.ezlok.com/inserts-for-wood?url=inserts-for-wood&info_id=40

good day

Floyd

[JeffHami]

I want to thank everyone for all their help and let you know the upgrade went great. I had to move the motor back and over to get it to work the way I wanted. I used 3 carriage bolts to hold the motor and I mounted the speed reducing pulley with the three large wood screws it came with. I bought my belts from Grainger Supply, they have just about every size belt you could want. 

[catskin]

Here is one thing nobody else has mentioned.  This is on a clutch motor BUT it would be equally true on any motor.  I just replaced a 2 1/2 inch pulley with one 1 1/2 ( No one mentioned 1 1/2 ) and it makes a big difference.   I just happened to have one hanging in my shop that had the right size bore.  SO if you could find one smaller than the one on your motor it would bring top speed down even more.  ( the one on your machine looks rather big )  The one I used was just a cheap aluminum one but it will work just fine for what I do.  Naturally the smallest pulley you can put on will depend on the shaft size but it sure looks like you can go much smaller than what is on there now.

[mikesc]

Here is one thing nobody else has mentioned. This is on a clutch motor BUT it would be equally true on any motor. I just replaced a 2 1/2 inch pulley with one 1 1/2 ( No one mentioned 1 1/2 ) and it makes a big difference. I just happened to have one hanging in my shop that had the right size bore. SO if you could find one smaller than the one on your motor it would bring top speed down even more. ( the one on your machine looks rather big ) The one I used was just a cheap aluminum one but it will work just fine for what I do. Naturally the smallest pulley you can put on will depend on the shaft size but it sure looks like you can go much smaller than what is on there now.

Actually the use of smaller pulleys with various types of motors has been mentioned many times here over the years, perhaps no-one mentioned it in this thread because they thought people might "search" before saying "nobody else has mentioned" ?

Edited January 15, 2018 by mikesc

[dikman]

On 1/2/2018 at 0:12 PM, Wizcrafts said:

Alternately, if the motor pulley is over 2", see about replacing it with one that is under 2" diameter. If the original pulley is 4", a 2" pulley will cut the speed in half and double the torque. A shorter v-belt will be needed for a smaller pulley.

I would have been surprised if it hadn't been mentioned, it's generally one of the first things suggested.