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Gear cutting
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Topic: Gear cutting (Read 11937 times)
chipenter
Hero Member
Posts: 909
Country:
Gear cutting
«
on:
September 09, 2013, 10:43:28 AM »
Made a 20 DP 20 tooth gear today , there wasn't enough metal to cut the key way and it split , guess I should have cut the key way first , the cast iron came from a dumbbell so something had to go wrong .
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Jeff
awemawson
Global Moderator
Hero Member
Posts: 8972
Country:
East Sussex, UK
Re: Gear cutting
«
Reply #1 on:
September 09, 2013, 11:03:01 AM »
Bad luck - how frustrating.
There's not a lot of meat left between the dedendum and the keyway, can the keyway be reduced in depth?
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Andrew Mawson
East Sussex
chipenter
Hero Member
Posts: 909
Country:
Re: Gear cutting
«
Reply #2 on:
September 09, 2013, 11:10:21 AM »
Thank Andrew I will try the fit before I cut the next one , I want a 20 tooth one as well my have to make that from steel .
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Jeff
Meldonmech
Hero Member
Posts: 933
Re: Gear cutting
«
Reply #3 on:
September 09, 2013, 12:53:17 PM »
Hi Chip
Can the size of the shaft be reduced, it looks large in comparison to your gear?
Cheers David
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Pete.
Hero Member
Posts: 1075
Country:
Re: Gear cutting
«
Reply #4 on:
September 09, 2013, 01:10:34 PM »
What kind of tool are you cutting the teeth with? Looks like you have a burr or it's dragging the back edge of the tool and carving a small step in one side of every tooth.
Crack looks like it's due to built-up stresses in the cast iron. I sometimes have to cut out cast iron tunnel sections and I've had quite a few split with a loud bang half way through cutting.
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chipenter
Hero Member
Posts: 909
Country:
Re: Gear cutting
«
Reply #5 on:
September 09, 2013, 02:45:04 PM »
It was a home made cutter using an and mill to get the profile , I split the gear using a standard broach knocking it though with a mallet , I have since successfully made another gear cutting the key way first .
Jeff
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Jeff
ALB
Jr. Member
Posts: 28
Country:
Aberdeen
Re: Gear cutting
«
Reply #6 on:
September 11, 2013, 02:38:58 PM »
Hello All,
I made this little gear cutter out of an old boss from a lawn mower shaft
Then made a 50 tooth gear out of nylon round this was my first ever gear cut Well pleased with the result
Next is to try and make one out of steel
Alb
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Don't put all your eggs in one basket
awemawson
Global Moderator
Hero Member
Posts: 8972
Country:
East Sussex, UK
Re: Gear cutting
«
Reply #7 on:
September 11, 2013, 02:47:42 PM »
Difficult to tell from your pictures, but is that an involute form? It looks more triangular but maybe that's the lighting.
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Andrew Mawson
East Sussex
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