Thread repair help needed

[Handy Don 10,609]

16 hours ago, Achto said:

drill a new hole through the bolt

 

I’m wondering about two things:

- getting the newly-drilled hole straight and in the right place

- the heat of cutting off the extra part of the Allen screw could soften the Locktite and cause the screw to shift

[Achto 26,566]

7 minutes ago, Handy Don said:

the heat of cutting off the extra part of the Allen screw could soften the Locktite and cause the screw to shift

 

Working temp of Loctite 640 sleeve retainer is 400F. Should be ok if one takes their time cutting. Maybe Sawzall first, then smooth out with a grinder.

[Retired Wrencher 4,877]

6 hours ago, ebinmaine said:

I've got some here too. But I'd like to see what you use.   

I take some picks tomorrow bud. I was gone all day to an old friend house.

[gt14rider 693]

What about 2 part epoxy putty. You can drill and tap it. Here's one kind, but there's a bunch different manufacturers. 

[ebinmaine 63,157]

2 hours ago, Handy Don said:

 

I’m wondering about two things:

Me too. 

 

2 hours ago, Handy Don said:

- getting the newly-drilled hole straight and in the right place

 

I could measure carefully following another case for pattern. 

 

2 hours ago, Handy Don said:

- the heat of cutting off the extra part of the Allen screw could soften the Locktite and cause the screw to shift

 

2 hours ago, Achto said:

 

Working temp of Loctite 640 sleeve retainer is 400F. Should be ok if one takes their time cutting. Maybe Sawzall first, then smooth out with a grinder.

 

Mobile bandsaw. ?

 

[Achto 26,566]

37 minutes ago, ebinmaine said:

Mobile bandsaw. ?

 

Perfect!! 

[Handy Don 10,609]

1 hour ago, ebinmaine said:

Me too. 

I could measure carefully following another case for pattern. 

Mobile bandsaw. ?

Be sure it’s a standard grade screw!

[Pullstart 59,733]

I bet a center punch, steady hand (or drill press) and going slow, most anyone could get it centered so the dog point screw can do it’s thing.

[ebinmaine 63,157]

21 minutes ago, Pullstart said:

I bet a center punch, steady hand (or drill press) and going slow, most anyone could get it centered so the dog point screw can do it’s thing.

 

I do NEED to get my drill press chuck centering better. That's a subject for another thread.  

 

As to this one though... I'm thinking I could put a 1/4-20 bolt in a good transmission case.  Use that to center and line up the transmission to the drill press by locking the good bolt in the drill press chuck. 

Loosen the assembly and lower it. 

Switch transmission cases and drill this one straight.  

 

 

Maybe????

 

 

[Handy Don 10,609]

12 minutes ago, ebinmaine said:

 

I do NEED to get my drill press chuck centering better. That's a subject for another thread.  

 

As to this one though... I'm thinking I could put a 1/4-20 bolt in a good transmission case.  Use that to center and line up the transmission to the drill press by locking the good bolt in the drill press chuck. 

Loosen the assembly and lower it. 

Switch transmission cases and drill this one straight.  

Maybe????

I'd be inclined more toward fabbing up a jig. Get it correctly positioned using a long screw through the jig into the hole on the good case with bends or adjusting screws and then move it to the to-be-drilled case. A fat dowel in the shifter hole could be main position/anchor. Also, I tend to drill small pilot holes first and follow up with the full-size bit.

Good luck!

[WHX?? 46,797]

3 hours ago, gt14rider said:

What about 2 part epoxy putty. You can drill and tap it.

I tried that stuff once. Called liquid steel. Didn’t work too hot. Drilled & tapped OK but didn't stick very well. Might not have it clean enough. Oil in metal pores? 

[Achto 26,566]

55 minutes ago, ebinmaine said:

As to this one though... I'm thinking I could put a 1/4-20 bolt in a good transmission case.  Use that to center and line up the transmission to the drill press by locking the good bolt in the drill press chuck. 

 

This would be the beauty of using an Allen bolt. You already have a guide to find the center of the bolt. Run a drill bit that just fits inside of the hex head down a little bit to mark center. Then switch to the size bit that you need for the tap. 

[ebinmaine 63,157]

38 minutes ago, Achto said:

 

This would be the beauty of using an Allen bolt. You already have a guide to find the center of the bolt. Run a drill bit that just fits inside of the hex head down a little bit to mark center. Then switch to the size bit that you need for the tap. 

 

So if you're using the center of the Allen head that means you'd be removing the existing bolt redrilling and resizing the hole well oversized so it's back to straight?

 

[Pullstart 59,733]

Maybe it’s just me, I think we are way over thinking this.  Figure the depth from the top surface, center the bit to the large opening with an eyecrometer, drill away.

[ebinmaine 63,157]

1 hour ago, Pullstart said:

Maybe it’s just me, I think we are way over thinking this.  Figure the depth from the top surface, center the bit to the large opening with an eyecrometer, drill away.

 My own eyecrometer ain't that accurate. 

 

Also, doesn't the shifter have to be pretty close to lined up to keep the geometry right?

 

 

[JoeM 7,636]

11 hours ago, ebinmaine said:

My own eyecrometer ain't that accurate.

Come on EB, go get BBT! 

[ebinmaine 63,157]

19 minutes ago, JoeM said:

Come on EB, go get BBT! 

 

I often do!! 

[Horse Newbie 6,859]

22 hours ago, ebinmaine said:

Also, doesn't the shifter have to be pretty close to lined up to keep the geometry right?

I’m thinking pretty close will do…

just my  worth…

[ebinmaine 63,157]

12 hours ago, Horse Newbie said:

I’m thinking PRETTY CLOSE will do…

just my  worth…

Agreed. 

That's why I phrased it as such.  

I'm thinking if I was within 3 widths of an outhouse either direction it'd work.