so i had to go bigger on the size of my post mount bolts. and i had to drill the mount to make it accept the new bolts. heres the issue: ive tried every dam type of drill bit there is that is relative to heat treated steel. NOTHING can cut it. ive even gone to the extent of using a carbide bit. the shop called me back the same day i bought the bit and said after 1/4" the bit shattered. how can i fix this issue?? any other ideas?

 

Are you drilling the mount itself?

 

yes from 3/8 to 1/2

 

Can you post a pic?

 

the mount is currently at the shop but i can go and get it tomorrow.

 

I'm sorry if this is an obvious question, sometimes it's just an overlooked issue...
How fast are you drilling it? Are you using lube/cutting oil on a semi-regular basis, while drilling it?

Going slow with a carbide bit, and lubing up the bit, should do the trick.

 

Ran into the same problem awhile back, got fed up and did a custom stud, larger thread (your choice) on the block side, to a shoulder then stepped to M10 for the mount, it's a bit of a pain in the ***, but the easiest remedy.

 

I remember a long time ago someone told me they had to do this and it was a PITA. He ended up using some kind of concrete drill bit and it worked out for him.

 

Can you just install a helicoil or time sert and use the original bolts?

 

thats my main issue as of right now, i do not know if the douches at the shop are even using cutting oil. if not then its their own dam fault they wasted 60 bucks on a bit and didnt use the oil. i hope they did

that was actually the same idea i first had! but i was scared to go through with it because i was afraid the grade 8 bolts would snap. so i decided against the idea
well i went to a 1/2 size on the hole from the original 3/8 size, so im not so sure how i could rig something to hold the weight and power on that setup. any ideas?

 

Anneal the mount first. Drill it. Should drill like butter once its annealed. Im assuming that workpiece was hardened from the attempted drilling. Go slow and use cutting oil. Use sharp bits.

 

anneal? what is that? it was hardened from the factory im thinking.

 

Its tue opposite of hardening. Heat it up red hot and keep it there for a bit. Cool it down very slowly using the torch to maintain some heat in it as it cools. If you wanted to reharden it when your done you would heat it up red hot an then dump a bucket of water on it.

 

Note this is the ghetto method of annealing and hardening but it should work.