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DENedbalek
07-08-2007, 02:29 PM
I've got a Jet 13-R Drill Press that I stripped a bolt off on. It's on/in the main casting of the head. The bolt's function is to tighten down on one of two shafts that hold the motor mounting plate. I've managed to finally get the bolt out of the whole, but in the process managed to really mangle the original hole. I am hoping to get some ideas for making a repair to the hole so that it is functional again. The bolt was an M8 about 3/4" long. Ideas I've thought about include filling the hole by wedging a piece of steel in with some epoxy and then re-drilling and tapping. I'd also considered abandoning the hole all together and drilling and tapping a new hole on the side of the shaft hole instead of the top. Pictures below are of the current situation.

http://i208.photobucket.com/albums/bb63/DENedbalek/Jet%20Drill%20Press%20Repair/100_0818Large.jpg

http://i208.photobucket.com/albums/bb63/DENedbalek/Jet%20Drill%20Press%20Repair/100_0817Large.jpg

http://i208.photobucket.com/albums/bb63/DENedbalek/Jet%20Drill%20Press%20Repair/100_0816Large.jpg

Dwayne

dicks42000
07-08-2007, 02:48 PM
Unlike Sleemans or Miller time it looks like your drillpress isn't having fun.
I guess it's time for a tread insert like a Helicoil and some locktite, or you can make up an insert plug yourself, redrill the hole & press & locktite the plug in place.....

ProGunOne
07-08-2007, 02:58 PM
Heli coil would be my suggestion also. Or why not just drill and tap oversize, say 1/2-13 and use a bigger bolt?

platypus2020
07-08-2007, 03:04 PM
I wouldn't use a helicoil, as this is an adjustment bolt to tighten the v-belts, and the bolt will be used as speeds are changed, in my experience helicoils work great in a bolt that is rarely moved after they are tightened, I'd use a Re-Nu thread repair insert, page 621 of the 2007 Enco catalog, Use these alot, work great. The newer Jet drill presses have that screw on the side of the adjustment slide, not underneath.

Jack

George Seal
07-08-2007, 03:06 PM
Dwayne
If it were me I would just slide a collar on with a set screw. All it does is maintain belt tension

tattoomike68
07-08-2007, 05:47 PM
A helicoil is a waste of time, just drill and tap it bigger.

DENedbalek
07-08-2007, 06:44 PM
Thanks for the input and suggestions. I think for now I'll just go with the collar and setscrew idea from George. When I get my mill back and operational I may try to drill it out larger and tap it. I don't think it would do well trying to drill it by hand.

Thanks,
Dwayne

lane
07-10-2007, 08:23 PM
Fill the hole with J B weld and drill another one in the side 90 to it . works for me.

Rookie machinist
07-11-2007, 01:44 AM
Try using a "time sert" they are a solid steel insert and are much stronger than a heli coil. As long as you can drill out the area. I had an oblong hole like yours where I used a larger insert then drilled it out to accept the correct size insert. Heres the link to their site and good luck.

www.timesert.com

Swarf&Sparks
07-11-2007, 12:25 PM
clear drill it and use a nut

tattoomike68
07-11-2007, 02:17 PM
Try using a "time sert" they are a solid steel insert and are much stronger than a heli coil. As long as you can drill out the area. I had an oblong hole like yours where I used a larger insert then drilled it out to accept the correct size insert. Heres the link to their site and good luck.

www.timesert.com

those inserts are realy good, there is another type that has 4 hard cutting keys that you tap in with a hammer that lock the insert that are good. we use them in parts like Cat tractor clutches.

DENedbalek
07-11-2007, 07:27 PM
Thanks for the ideas guys. I'll going to try something this weekend.

Dwayne