Reducing backlash without antibacklash gears
Reducing backlash without antibacklash gears
(OP)
Hi all,
I am trying to design a gear train for an encoder system (negligible force exerted on the system). The gears are fairly small though. Right now I am using a dp of 48 and was wondering if going to a higher number could possibly decrease backlash. I think going to higher than AGMA Q9 is out the question price wise. Any thoughts would be appreciated.
Thanks
I am trying to design a gear train for an encoder system (negligible force exerted on the system). The gears are fairly small though. Right now I am using a dp of 48 and was wondering if going to a higher number could possibly decrease backlash. I think going to higher than AGMA Q9 is out the question price wise. Any thoughts would be appreciated.
Thanks





RE: Reducing backlash without antibacklash gears
Mike Halloran
Pembroke Pines, FL, USA
RE: Reducing backlash without antibacklash gears
RE: Reducing backlash without antibacklash gears
But, if there is negligible force, can one of the gears be on a spring-loaded pivotable mount, so that the engagement is forced?
RE: Reducing backlash without antibacklash gears
Why not try a friction gear arangement instead of toothed gears?
RE: Reducing backlash without antibacklash gears
@Clyde38 I am not sure I fully understand a friction gear arangement. Is that basically no teeth, just rollers? I have been thinking some fairly rigid rollers would do fine.
@williedawg Not sure that would work only because of size issures. Otherwise the max rotation is only +/-170.
I think it would help if I gave a little more scope for the project. those gears all have a face width of less than .1" The black cylinder is a magnet and the drive gear is the larger one in back. The goal is a 1:1 ratio all within this space. Oh and it will all be submerged in mineral oil.
RE: Reducing backlash without antibacklash gears
RE: Reducing backlash without antibacklash gears
Yes, just rollers (zero backlash and no lost motion). Find a material that will deliver the performance you need when submerged in mineral oil.
RE: Reducing backlash without antibacklash gears
I just realized the problem with rollers is that it might be difficult to keep the required ratio exactly 1:1 especially since they would be deforming at the contact point.
RE: Reducing backlash without antibacklash gears
http://www.fallbrooktech.com/02_demo.asp
RE: Reducing backlash without antibacklash gears
RE: Reducing backlash without antibacklash gears
Acetal is best for engineered plastic gears, but this application is begging for resilient gears like Nylon 6/6. I had good experience with gear trains running into stall when using 6/6.
RE: Reducing backlash without antibacklash gears
Is stall a good thing? Honestly confused about your sentences. Can we get Nylon 6/6 gears at a good cost(competitive to machined bronze gears, the current design choice) in low quantities?
RE: Reducing backlash without antibacklash gears
In some designs the powers that be will not allow mechanical stall torque protection, so you have to resort to thermistors and flexible gears. I have had some success with bellville spring slip clutches, but the cheapest way is thermistors and flexible gears. Your car seat gearmotors probably are designed that way.
By the way:
thermistors provide quick resistance rise when hit with high stall current in a DC circuit.
RE: Reducing backlash without antibacklash gears
RE: Reducing backlash without antibacklash gears
http://www.torsen.com/products/T-3.htm