having trouble with mini bike build

[johnnyp]

I asked about a wire welder because that is how I remove broken bolts. I am one of the older guys and I have always used a bolt, fender washer and a lock washer to mount a clutch. It would make no sense to explain how I remove broken bolts because you don't have a welder, and there is no bolt in there.

i would weld (spot) a bolt to the broken bolt and walk it out of there with a wrench that fits the head of the bolt you spot welded onto the busted bolt

 

[sparkwizard]

Correct, My Friend! There is a thread about a drilling guide. https://www.oldminibikes.com/forum/index.php?threads/crankshaft-drill-guides-for-5-16-24.170615/

I weld nuts on the broken bolts. Welding a bolt to a bolt, I tend to weld the bolt to the crankshaft.

 

[creia]

It takes 30 minutes to drill and tap
That crank….if it a broken bolt…

Drill Hog USA 6 Pc Square Easy Out Set Straight Screw Extractor….

I bought a set something very similar to this that the maintenance guys at the plant used….I have found nothing yet I can’t remove….

Thank you for the information Skipp. I am going to try these as I have never had much success with the typical hardware store "easy outs".
Michael

 

[SAT]

I still have a few of my 5/16-24 drill tap guides for 3/4” and 5/8” crankshafts.
$20 plus shipping. Sized for a Letter I drill bit.

 

[older then dirt]

I still have a few of my 5/16-24 drill tap guides for 3/4” and 5/8” crankshafts.
$20 plus shipping. Sized for a Letter I drill bit.

I bought one of these a few years back. WORKS GREAT!

 

[SAT]

I can machine them for any output shaft OD and any thread form.

 

[johnnyp]

i have machined and tapped holes before but was able to do it by hand. do i have to remove the crank and put it in a drill press? what is the process that most guys have been using to drill and tap this crank?

 

[Skipp]

Thank you for the information Skipp. I am going to try these as I have never had much success with the typical hardware store "easy outs".
Michael

That is not the exact brand I bought…if wanted I can supply that info…

 

[creia]

That is not the exact brand I bought…if wanted I can supply that info…

Yes, please do.
Michael

 

[Skipp]

 

[creia]

View attachment 305952 View attachment 305953 View attachment 305954

Thank you!
Michael

 

[RobertC]

To drill the crank pto by hand...most folks use a jig that is made of steel with a hole for the shaft to slip in...and a hole on the end of the jig, to guide your drill bit.

Check with member @SAS289 he sometimes has sets available.

High quality, and a good price.