Model Boat Mayhem

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: gear cutters  (Read 2498 times)

hopeitfloats

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,705
  • Location: ashburton. new zealand
gear cutters
« on: July 27, 2013, 10:04:15 am »
has anyone here tried to make an involute gear cutter and successfully cut gears with it. looking at making one to cut some new gears for my lathe screw feed. only made of a fibre type  material so hoping a homemade one will do. hi tensile steel and hardening the  tips with kasenit is my plan. any advise or opinions greatly appreciated.
Logged

mrsgoggins

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 207
  • Model Boat Mayhem Forum is the Best!
  • Location: Oldham
Re: gear cutters
« Reply #1 on: August 01, 2013, 06:02:46 am »
Just spotted your thread.
Never done it with home made cutters. I recall some info in Model Engineer on the making of flycutters but you would need to know the module/DP and pressure angle. If you are interested I will try and find it but can't promise success.
Regards
Keith
Logged
Chasing perfection but not running fast enough!

Circlip

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 4,463
  • Location: North of Watford, South of Hadrians wall
Re: gear cutters
« Reply #2 on: August 01, 2013, 01:24:53 pm »
It's fibre for a reason, either for noise isolation or a "Fuse" or both.
 
  Emco lathe?
 
  Regards  Ian.
Logged
You might not like what I say, but that doesn't mean I'm wrong.
 
What I said is not what you  think you heard.

hopeitfloats

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,705
  • Location: ashburton. new zealand
Re: gear cutters
« Reply #3 on: August 01, 2013, 01:36:13 pm »
I have just found a book on gear cutting so hopefully I will get some more info from that. thanks for the offer keith and will certainly keep your offer in mind if I cant make sense of the book. ian I have the fibre to make the gears. it was the cutter I hope to make from the hardened steel. just thought you may have misunderstood  but also a big thanks for taking the time to advise.
Logged

Circlip

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 4,463
  • Location: North of Watford, South of Hadrians wall
Re: gear cutters
« Reply #4 on: August 01, 2013, 01:43:17 pm »
You will need to make your gear material (Tufnol "Whale"?) into a sandwich with supportive skins on either side to stop the gear material delaminating when cutting it.
 
   Lathe?
 
 Regards  Ian.
Logged
You might not like what I say, but that doesn't mean I'm wrong.
 
What I said is not what you  think you heard.

hopeitfloats

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,705
  • Location: ashburton. new zealand
Re: gear cutters
« Reply #5 on: August 01, 2013, 01:52:03 pm »
cant recall make of lathe but its a Taiwanese knock off of a myford ML7.  I got the fibre board from a specialist supplier and it has got a sandwich effect. almost looks like fibreglass reinforcing
Logged

Circlip

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 4,463
  • Location: North of Watford, South of Hadrians wall
Re: gear cutters
« Reply #6 on: August 01, 2013, 01:57:40 pm »
Yep, it's a lamination of Phenolic resin and Linen. It may be a Mifford rip but more likely to be an Emco lift as the Taiwanese and later the Chinese mainland used that as a standard.
 
  Regards  Ian.
Logged
You might not like what I say, but that doesn't mean I'm wrong.
 
What I said is not what you  think you heard.

fpravenscroft

  • Shipmate
  • *
  • Offline Offline
  • Posts: 23
  • Location: St. Helems
Re: gear cutters
« Reply #7 on: August 01, 2013, 02:30:05 pm »
try tracy tools they sell gear cutters reasonably cheap but you will have to work out the dp or moule size dp +imperial module = metric
find the od of the gear and divide it by the number of teeth +2 that will give you the dp
regards
peter
Logged

hopeitfloats

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,705
  • Location: ashburton. new zealand
Re: gear cutters
« Reply #8 on: August 02, 2013, 09:55:39 am »
would a dp of 1.2 sound right. gear = 36mm OD x (28 teeth + 2)
Logged

fpravenscroft

  • Shipmate
  • *
  • Offline Offline
  • Posts: 23
  • Location: St. Helems
Re: gear cutters
« Reply #9 on: August 02, 2013, 02:46:03 pm »
the answer needs to be a whole number i got it wrong it is the number of teeth +2 divided by the od and the nearest i can get is .8 mod hopes this helps
regards
peter
Logged
Pages: [1]   Go Up
« previous next »
 

Page created in 0.08 seconds with 21 queries.