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Gun drilling shafts

Nikolai

Nikolai

TY 4 Stroke God
Joined
May 27, 2006
Messages
2,423
Location
Anchorage, Alaska
Spent a few hours searching Google and here prior to posting.

The Apex jackshaft is already hollow. I would like to look into gun drilling the driveshaft. Just want to get an idea of costs and if anyone knows a shop that is able to do it. Googled only produced a few large machine shops that won’t do it. Issue is drilling an already manufactured shaft, both shops want to drill hex stock first and then make the shaft after it’s drilled. Some very old threads from Hardcore Sledder and Amsnow forums tell me people have had it done before.

1. Has anyone had this done?
2. Idea of cost?
3. Shop that has drilled snowmobile shafts before?
4. Hole size? Would need to be drilled to use correct tap for either a 12mm or 14mm bolt to retain the gear.
 

1 hole straight thru the center. I think with the newer hollow shafts there just isn’t much focus on the old stuff anymore.
 
Gun drilling can cause areas of fracture due to the marks left internally from the drilling process. It is also very hard to drill an already manufactured shaft due to the fact that it is very difficult to keep the drilling centered perfectly in the shaft. Micro Belmont used to gun drill shafts, but they won't do it anymore.
 
We used to run gun drilled shafts. Never again. The little bit of weight saved is nothing and like Alan said, they break and twist off.
 
Shafts are one area I wouldn't skimp on. We ended up making oversized titanium shafts to keep flex and breakage at bay. They were heavy even being made of ti, but never broke them anymore and they didn't flex.
 
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