Gears

Check Boston gears and see if they have them. They will have an ID site you can look at for the DP. Or go to Mr Pete’s you tube site, watch the video on logan gears and I believe he will give a formula for figuring the DP. Watching the video will help in ordering from Boston or in looking on eBay for what you need.
 
Without a doubt, those are 20DP. No idea what the pressure angle is. You'll need to know the PA if the new gears must work with others in the original set. Change gears like these are typically a special breed of animal because they are hub-less. How many gears are in your complete set?

I have only 1 cutter in 20DP and off the top of my head, don't know what PA or tooth range it is for. I make custom stuff like this all the time but in this case, I doubt you would want to absorb the cost of the cutters. In this case, you need 3 different cutters.

Ray
 
Take a picture of a good gear in the set. It must be very clear and fill the whole frame without cutting-out any portion of the image. It needs to look something like this. High resolution is needed. Never mind all the circles drawn... I'll need to do that to your picture to determine the pressure angle. You must photograph one of the good gears in the set. If I can't get a perfectly good image, I won't be able to determine the PA.

If all gears are badly worn or if by some chance, it's not a standard 14.5 or 20 degree pressure angle (very unlikely) I won't be able to determine what type of cutter is needed. If I can figure out the PA, we can work something out.


GearCloseUp.jpg


Ray
 
Here s pics of the good gears. I can also send the gears to you and we can go from there if that works.
gear 40.jpg
good gear 40.jpg
 
Here s pics of the good gears. I can also send the gears to you and we can go from there if that works.
View attachment 268508View attachment 268509

Check your Inbox for a PM with my email address. When downloading the pictures, they are very low resolution and pixilate badly after 1.5x magnification. You'll need to email them directly to me. THe basic quality is good. If possible just re-do them with the lens dead in-line with the axis of the bore so you cannot see any of the sides of the bore in the photo. BTW: I'm having a memorial day observation with family and friends today so, I won't be able to do much with this until later this evening.

Ray
 
I understand. Im in no hurry. I appreciate your time and willingness to try to help
 
I understand. Im in no hurry. I appreciate your time and willingness to try to help

Thanks... BTW, this is not some wild goose-chase. I've done this before. In days gone by, the techniques I'm using were done with optical comparators / magnifiers and calibrated circular cut-outs. Nowadays, we have the advantage of digital cameras.

Ray
 
What are the logan stock numbers for the gears? Are they out of the QCGB?
 
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