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Drilling CL 72 crank for a stater clutch

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G-Man
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Re: Drilling crank

Post by G-Man » Sun May 12, 2019 2:53 pm

You might be able to find someone in your area that specialises in Spark Erosion.


https://edmprecision.com/spark-eroding/


G

Kthomas55 wrote:I ordered bits from my local Fastenal. The just barely made a dent. They said the next price up was 30+ dollars apiece for a 2mm bit. I’m either going to try one more time by ordering some bits or buy another crank. These were cobalt bits.
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Kthomas55
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Location: Burnsville, NC 28714

Drilling

Post by Kthomas55 » Fri May 17, 2019 7:45 am

I think I’m just going to get another crank. I’ve tried 8 different bits. Honda had some hard metal ! The last two bits I used were Artu’s which were recomended. On there site they describe the multi-purpose for hardened steel but I couldn’t find those in that small of a size. 2mm or 5/64. As you know buying cranks off line is a crapshoot .
Spark erosion would probably work but finding someone around here won’t be easy.

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Tim Allman
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Re: Drilling

Post by Tim Allman » Fri May 17, 2019 9:29 am

Kthomas55 wrote:I think I’m just going to get another crank. I’ve tried 8 different bits. Honda had some hard metal ! The last two bits I used were Artu’s which were recomended. On there site they describe the multi-purpose for hardened steel but I couldn’t find those in that small of a size. 2mm or 5/64. As you know buying cranks off line is a crapshoot .
Spark erosion would probably work but finding someone around here won’t be easy.
I have a suggestion. Where I live one of the major industries is car and car parts production and to support this there are dozens of companies supplying the factories. I have found that by asking around I have been able to find things that would never be carried by a hardware store. Odd tools can be expensive(!) but they are often available.

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G-Man
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Re: Drilling

Post by G-Man » Fri May 17, 2019 10:16 am

As a last suggestion - how about a diamond burr in a Dremel or similar. You may need the patience of a saiint but it should work.

https://www.ebay.com/itm/30pcs-Diamond- ... Sw2DdbMu33

G
Kthomas55 wrote:I think I’m just going to get another crank. I’ve tried 8 different bits. Honda had some hard metal ! The last two bits I used were Artu’s which were recomended. On there site they describe the multi-purpose for hardened steel but I couldn’t find those in that small of a size. 2mm or 5/64. As you know buying cranks off line is a crapshoot .
Spark erosion would probably work but finding someone around here won’t be easy.
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Kthomas55
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Posts: 36
Joined: Tue Dec 26, 2017 9:02 pm
Location: Burnsville, NC 28714

Post by Kthomas55 » Fri May 17, 2019 12:19 pm

That’s a great idea.
I thought about a burr on a Drexel but thought it would dull fairly quick. A diamond type burr might do it

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G-Man
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Post by G-Man » Fri May 17, 2019 12:48 pm

You might need to build a little moat around the hole to contain some lubricant/coolant. Do you have plasticine in the US? That should work.

G
Kthomas55 wrote:That’s a great idea.
I thought about a burr on a Drexel but thought it would dull fairly quick. A diamond type burr might do it
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

LOUD MOUSE
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Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Fri May 24, 2019 5:43 pm

Are you needing CB72 crank? ................. lm


Kthomas55 wrote:That’s a great idea.
I thought about a burr on a Drexel but thought it would dull fairly quick. A diamond type burr might do it

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