Hi all,
I need to calculate servo drive ratio for a lifting manipulator which is driving on some rails.
I have a Lenze gearbox with ratio 25.294 and a gear where 1 revolution is approximately 250mm in travel distance. d*π.
Hi Tobias,
If i have read your picuteres correct you have a wheel wiht 25 teeth and the size of each tooth is 8 so the travel distance or rotary to linear transform will be:
NoTeeth * u = 25 * 8 = 200mm.
Which unit to use depends on your measurement unit set up on your axis configuration, but it is standart mm.
Where have you gotten your gear ratio from?
Hi,
I agree with @piekutt .
The gear ratio seems to be an aproximate number of a 3-stage gear box.
Knowing that usually at least 1 prime number is involved the precise ratio should be 430:17.
If possible, please confirm this with Lenze.
The configuration in mapp Motion would look like this:
@piekutt
Hi Tobias,
Thanks you for explanation.
My ratio/travel distance was calculated d x π (79,58 x π).
@Martin.Schrott
Hi Martin,
Certanly I will check with Lenze, becuse I am also used to gear ratios in fractions and not decimal numbers.
I don’t use mapp motion. How can I calculate or where can I add this 200mm to ratio?
Thank you all!
In the Acp10 configuration we set load.units = gearbox.output_revolutions x units_per_gear_out_revolution
units = 17 x 200mm = 3400
rev_motor = 430
Maybe a more precise unit than mm would be useful, like 1/10 mm (units = 34000) or 1/100 mm (units = 340000).
@Martin.Schrott Thank you for you answer. Everything is clear now.
@piekutt What if I have a sprocket and don’t have u parameter.
So here I asume you are pulling some sort of chain. So you have some chain lenght and some amount of links.
Length / NoLinks = LinkLenght
Then we can find out how many links you move per rev of your motor.
NoTeeth * LinkLenght = TravelDistance.
But if this used to connect to gear we are not interrested in the travel distance but more in the gear ratio between the two gears
