first helical gear

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Posted by Jim Pollock on April 20, 2012 at 22:12:17:

I have an old Barber colman #12 hobber that has no differential. I have never cut a helical gear before but I need to make one now and I have one to duplicate but I am not sure about how to get an accurate measurement on the helix angle of my sample gear. I did roll it on paper up against a straight edge and then measured the angle of the marks left on the paper and I got 35 degrees. Would this be accurate enough? This gear has 12 teeth and I believe it to be 7dp. The od measures 2.530"

How big of a night mare would it be to cut this on my old hobber? I have the manual for it but it does seem quite complicated to gear it properly to cut this gear. I think that I would have to make some new gears for my index and feed as I don't have a complete set.

Follow Ups:

Re: first helical gear BillS 08:50:22 04/23/12 (0)
Re: first helical gear Frank 08:46:54 04/21/12 (23)
- Re: first helical gear Jim Pollock 11:10:01 04/21/12 (22)
  - Re: first helical gear Jim Pollock 21:54:32 04/22/12 (21)
    - Re: first helical gear BillS 09:13:33 04/23/12 (20)
      - Re: first helical gear Jim Pollock 17:53:14 04/23/12 (19)
        
        Re: first helical gear Jim Pollock 13:24:41 04/24/12 (2)
        
        Re: first helical gear Jim Pollock 13:28:27 04/24/12 (1)
        
        Re: first helical gear Jim Pollock 13:33:29 04/24/12 (0)
        
        Re: first helical gear BillS 10:31:35 04/24/12 (13)
        
        Re: first helical gear Josh 13:07:05 04/24/12 (4)
        
        Re: first helical gear BillS 13:59:10 04/24/12 (3)
        
        Re: first helical gear josh 15:10:32 04/24/12 (2)
        
        Re: first helical gear BillS 17:23:55 04/24/12 (1)
        
        Re: first helical gear Ron V 16:11:14 04/25/12 (0)
        
        Re: first helical gear Jim Pollock 11:45:05 04/24/12 (0)
        
        Re: first helical gear Jim Pollock 11:26:51 04/24/12 (6)
        
        Re: first helical gear BillS 12:23:20 04/24/12 (5)
        
        Re: first helical gear Jim Pollock 12:26:08 04/24/12 (4)
        
        Re: first helical gear Bill S 14:02:50 04/24/12 (3)
        
        Re: first helical gear Jim Pollock 16:49:29 04/28/12 (2)
        
        Re: first helical gear Rich S 23:45:46 01/15/16 (0)
        
        Re: first helical gear Josh 09:37:51 04/30/12 (0)
        
        Re: first helical gear BillS 10:00:04 04/24/12 (0)
        
        Re: first helical gear Josh 20:45:41 04/23/12 (0)

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