Jack shaft size

[Frodo]

My servo pulley is 2”

the jack shaft has a 5” pulley on one side

with no pulley on the other

the machine head has a 3” pulley on it

if I set the pulleys up in this order 

servo2”   5” jack shaft

X size  jack shaft   To 3” head pulley

would  X pulley need to be 2”?

if the slave pulley (x) is larger than the master (5)  would that defeat the of  rpm?

 

[kgg]

52 minutes ago, Frodo said:

My servo pulley is 2”

the jack shaft has a 5” pulley on one side

with no pulley on the other

the machine head has a 3” pulley on it

if I set the pulleys up in this order 

servo2”   5” jack shaft

X size  jack shaft   To 3” head pulley

would  X pulley need to be 2”?

if the slave pulley (x) is larger than the master (5)  would that defeat the of  rpm?

With the arrangement of the set 1 pulley = 2" (servo motor) with a large pulley = 5" and set 2 pulley = 2" with the machine pulley = 3" (handwheel) then:

1. servo motor at 100 rpm the handwheel will turn at 27 rpm's

2. the center of the pulley on the servo motor to the center of the reducer pulley (2" x 5") should be 10"

3. the center of the reducer pulley (2" x 5") to the center of the 3" handwheel should be 14"

4. the reduction ratio is 1:3.75 at the handwheel

kgg

 

[chuck123wapati]

1 hour ago, Frodo said:

My servo pulley is 2”

the jack shaft has a 5” pulley on one side

with no pulley on the other

the machine head has a 3” pulley on it

if I set the pulleys up in this order 

servo2”   5” jack shaft

X size  jack shaft   To 3” head pulley

would  X pulley need to be 2”?

if the slave pulley (x) is larger than the master (5)  would that defeat the of  rpm?

 

2 to 5 then 5 to 2 would negate it completely 3 to 2 would negate it somewhat.  what is your maximum intended output rpm?

[kgg]

1 hour ago, Frodo said:

My servo pulley is 2”

 

9 minutes ago, chuck123wapati said:

2 to 5 then 5 to 2 would negate it completely 3 to 2 would negate it somewhat. 

I forgot to add the calculator I used for your arrangement so you can decide what arrangement would work with your setup: ( https://www.blocklayer.com/pulley-belteng )

kgg

Edited January 9, 2023 by kgg

[chuck123wapati]

2 minutes ago, kgg said:

 

I forgot to add the calulator I used for your arrangement so you can decide what arrangement would with your setup: ( https://www.blocklayer.com/pulley-belteng )

kgg

sweet calculator !!!!! sure takes out the brain work lol. Thanks, I will be saving that. 

[kgg]

5 minutes ago, chuck123wapati said:

sweet calculator !!!!! sure takes out the brain work lol. Thanks, I will be saving that. 

Saves a lot of time and figuring. I came across this calculator when I had to change the pulley system on my wood furnace a few years back.

kgg

[Frodo]

Thank you kgg

 

could not get back yesterday 

I was at the hospital giving birth to kidney stones

 

[kgg]

4 hours ago, Frodo said:

I was at the hospital giving birth to kidney stones

That is never good, I know first hand that birthing process. Take it easy for few days.

kgg

[Frodo]

2 hours ago, kgg said:

That is never good, I know first hand that birthing process. Take it easy for few days.

kgg

 

looks like according to the calculations

2”” then a  6”” next to an 8”” that goes to a  6”  and the machine is 3”

 

 

 

 

[kgg]

I think you were brewing them for a while and at least they were the smooth ones not the star shaped ones.

2 hours ago, Frodo said:

looks like according to the calculations

The main thing is how slow do you want to go and what you are going to set the rpm of the servo motor too. So you will have to play with the pulley sizes on the calculator as well as the rpm of the servo motor.

kgg

 

[Frodo]

Servo set at 350

I want to go very slow around corners and such as that

30 per minute or less

[kgg]

29 minutes ago, Frodo said:

Servo set at 350

I want to go very slow around corners and such as that

30 per minute or less

The constants you have as I understand them:

1. the size of the motor pulley for set 1 pulley is 2"

2. the size of the handwheel for set 2 pulleys and you want to use a 5" large pulley

3. the speed of the motor max to be 350

4. the rpm of the set 2 pulley to be 30 when sewing around corners

What I would suggest according to the calculator to get 30 rpm is

1. set 1 small pulley 2" (motor pulley) with a 5" large pulley and set 2 would be a 1.5 small pulley alongside the 5" on the same shaft giving the handwheel a speed of 30 rpm with 150 rpm on the motor

When you increase your motor speed up to 350 rpm (max setting) by fully depressing the foot pedal the handwheel rpm would be 70. The pulley alongside the 5" pulley has to be smaller then the handwheel pulley.

kgg