Re: !956 Power window electric motor
Posted by HH56 On 2016/3/20 10:29:57
Quote:
Don't know but kind of doubt it. It will be in the box and you can see what you think when you receive the stuff. The stock 6 tooth pinion is .700 in diameter tooth tip to tip.
On a quick glance I am thinking that milling the silver gear deeper would put teeth too close to shaft hole and won't leave much for strength. I'd be concerned a tooth would break off. When the pinion abruptly stops as it does when window hits full up or down there is a lot of torque on the pinion. The zinc adapter I made lasted about twice hitting the stop on regulator before a tooth broke -- but that failure could have been due to the crudeness of casting..
Another question would be cost. Was thinking after I made the plastic piece most of it didn't need to be any particular size. It has to fit thru the hole in the Packard motor mounting plate and after that there are only 3 places it needs to be precise -- shaft into regulator bushing, pinion diameter and location, and the square end to slide into motor. I think it could be made from a single piece of 3/4 stock turned to size but will admit to not knowing how exactly the teeth would be machined. Would machining the gear separately and making an extension to use it be cheaper than making or casting a single piece? CNC would probably be inexpensive once the setup costs were taken care of.
EDIT: Here is what I was thinking of with a single piece. Quick and dirty out of 3/4 stock. How to cut the teeth and size the transition as it narrows down so as to avoid a stress point I have no firm ideas on. One good thing is the pinion can be any width. As long as the section that is in direct contact with the regulator gear is correct the rest could actually be quite wide and flow right into the 3/4 portion without problems.
Attach file:
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Riki wrote:
h,
on that silver gear, will 1/16th off od, then mill it deeper, another 1/16th,
Don't know but kind of doubt it. It will be in the box and you can see what you think when you receive the stuff. The stock 6 tooth pinion is .700 in diameter tooth tip to tip.
On a quick glance I am thinking that milling the silver gear deeper would put teeth too close to shaft hole and won't leave much for strength. I'd be concerned a tooth would break off. When the pinion abruptly stops as it does when window hits full up or down there is a lot of torque on the pinion. The zinc adapter I made lasted about twice hitting the stop on regulator before a tooth broke -- but that failure could have been due to the crudeness of casting..
Another question would be cost. Was thinking after I made the plastic piece most of it didn't need to be any particular size. It has to fit thru the hole in the Packard motor mounting plate and after that there are only 3 places it needs to be precise -- shaft into regulator bushing, pinion diameter and location, and the square end to slide into motor. I think it could be made from a single piece of 3/4 stock turned to size but will admit to not knowing how exactly the teeth would be machined. Would machining the gear separately and making an extension to use it be cheaper than making or casting a single piece? CNC would probably be inexpensive once the setup costs were taken care of.
EDIT: Here is what I was thinking of with a single piece. Quick and dirty out of 3/4 stock. How to cut the teeth and size the transition as it narrows down so as to avoid a stress point I have no firm ideas on. One good thing is the pinion can be any width. As long as the section that is in direct contact with the regulator gear is correct the rest could actually be quite wide and flow right into the 3/4 portion without problems.
Attach file:
(26.30 KB)
(28.19 KB)
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