B
BuffaloBill
Guest
Any ideas on where to purchase a spur gear?
The smaller gear on the moveable back gear is missing 2 teeth and an adjacent tooth is as good as gone. I've read about various methods of repairing and think I'd like to turn off the old teeth, purchase a new spur gear, boring the ID to fit over the turned-down area of the back gear hub (not sure what terminology to use here), and bond or silver solder it on there.
The damaged gear is straight-cut, has 35 teeth, an OD of 2.314". From that, I understand this to be a 16 pitch. Comparing the shape of the teeth to photos showing examples of 14.5 and 20 degree pressure angles, I believe my gear is 20 degrees. Also using a measurement method found online confirms the 20 degree PA. The width is 0.866"
I read posts that recommend Boston Gear. I didn't find on their site a way to inquire about a specific gear and I haven't phoned them yet. I did find on Rushgears site a way to request a quote. So I did so.
I asked for:
Cast iron
35T
16 pitch
20 degree PA
0.75" width
I received an email with quote within an hour and was totally shocked by the price. Where did I go wrong? I specified cast iron, should I have asked for mild steel instead? The price quoted for 1 piece was $1585!
I found a pdf of a Boston Gear catalog showing (stocked?) gears available. They show various tooth count in a 16 pitch 20 degree PA but not a 35 tooth. Is 35 teeth an "odd" number?
I was expecting the Spur gear to be maybe $50-$100. Am I dreaming?
Any sugestions? Thanks in advance.
Bill
The smaller gear on the moveable back gear is missing 2 teeth and an adjacent tooth is as good as gone. I've read about various methods of repairing and think I'd like to turn off the old teeth, purchase a new spur gear, boring the ID to fit over the turned-down area of the back gear hub (not sure what terminology to use here), and bond or silver solder it on there.
The damaged gear is straight-cut, has 35 teeth, an OD of 2.314". From that, I understand this to be a 16 pitch. Comparing the shape of the teeth to photos showing examples of 14.5 and 20 degree pressure angles, I believe my gear is 20 degrees. Also using a measurement method found online confirms the 20 degree PA. The width is 0.866"
I read posts that recommend Boston Gear. I didn't find on their site a way to inquire about a specific gear and I haven't phoned them yet. I did find on Rushgears site a way to request a quote. So I did so.
I asked for:
Cast iron
35T
16 pitch
20 degree PA
0.75" width
I received an email with quote within an hour and was totally shocked by the price. Where did I go wrong? I specified cast iron, should I have asked for mild steel instead? The price quoted for 1 piece was $1585!
I found a pdf of a Boston Gear catalog showing (stocked?) gears available. They show various tooth count in a 16 pitch 20 degree PA but not a 35 tooth. Is 35 teeth an "odd" number?
I was expecting the Spur gear to be maybe $50-$100. Am I dreaming?
Any sugestions? Thanks in advance.
Bill