Print Page - Old School Mechanic Needed

Title: Old School Mechanic Needed
Post by: LowGear on February 27, 2011, 07:46:16 PM

I'm electrifying a Polaris ATV with the innards of an old electric golf car. I had my motor mount cut by the welding shop down the road with their plasma cutter. What a neat machine but I digress. I missed on two of the holes by about 1/4 inch. Its made of 3/8ths plate steel. The two primary holes are really nice but these second two really make the mount seem much stronger. I don't really want to rat tail file the 3/8ths holes for a quarter inch so I was wondering if there was a fix besides welding up these holes and re-drilling new ones?

Casey

Title: Re: Old School Mechanic Needed
Post by: Tom Reed on February 27, 2011, 08:17:23 PM

Thread the holes that are in the wrong location, screw in a bolt with locktite and grind smooth. Redrill new hole in desired location.

Title: Re: Old School Mechanic Needed
Post by: luv2weld on February 28, 2011, 08:50:18 AM

If I'm reading this correctly, you have 2 holes that are 3/8" in diameter through a
piece of 3/8" plate that are 1/4" off??

Why not just use the rat tail file and then flat washer it??
Flat washer (or fender washer) between the motor and plate on all 4 holes.
I don't know how much stress is going to be put on the motor, but I don't think
it would give you a problem with shifting.
To make sure, you could always use Loctite Sleeve retainer on the the washer to plate
surfaces.

Ralph

Title: Re: Old School Mechanic Needed
Post by: Crofter on February 28, 2011, 10:01:05 AM

I think I would be filling with weld, grind flat and re-drill.

Title: Re: Old School Mechanic Needed
Post by: mobile_bob on February 28, 2011, 10:22:33 AM

plus one for welding in shut and redrilling

use a mig and lace it shut, grind and redrill and it will be perfect

much better repair, cheaper and probably quicker than going to the store for flat washers or loctite.

fwiw

bob g

Title: Re: Old School Mechanic Needed
Post by: vdubnut62 on February 28, 2011, 06:36:57 PM

I'd weld 'er up too
Ron.

Title: Re: Old School Mechanic Needed
Post by: rl71459 on March 01, 2011, 09:48:11 AM

I vote for the weld it drill it method also

Title: Re: Old School Mechanic Needed
Post by: rcavictim on March 01, 2011, 10:01:56 AM

I also vote for weld, grind and re-drill. That would be far easier than trying to insert a threaded plug.

Title: Re: Old School Mechanic Needed
Post by: Carlb on March 01, 2011, 12:19:51 PM

I also agree, weld, grind and re-drill

carl

Title: Re: Old School Mechanic Needed
Post by: Crofter on March 01, 2011, 02:14:43 PM

Off topic, but, that drill, tap, plug, offset and repeat, is an excellent way to sew up a freeze crack.

Title: Re: Old School Mechanic Needed
Post by: LowGear on March 01, 2011, 08:03:07 PM

I think it's pretty much resolved. Either I weld up the hole and re-drill or fudge the truth. I did consider going to a #7 or so 1/4" bolt but I'm too ignorant to know if that would be strong enough.

Thanks,
Casey

Title: Re: Old School Mechanic Needed
Post by: rbodell on March 06, 2011, 07:06:50 AM

Too much work, just get one of these.

https://picasaweb.google.com/rbodell/Mar62011#5580967802532849714

Title: Re: Old School Mechanic Needed
Post by: LowGear on March 06, 2011, 11:03:55 AM

Aloha rbodell,

I understand the grade 8 is only two bits but the insertion tool is $189.00. This drawing might do well on the old "get screwed" poster. Or bank here ad.

Casey

Micro CoGen.

Micro-Cogeneration Systems => Members Projects => Topic started by: LowGear on February 27, 2011, 07:46:16 PM