Removing turbogold woodscrews

[LemurLes]

Replaced a 1.8m gatepost and hung gate with 5x50 turbogold woodscrews [2mm pilot holes run before fitting, and moly grease applied]. Gate has dropped, and when trying to remove screws to rehang, first 3 heads [24 screws in place] sheared. Haven't tried any more yet. As screws are said to be case hardened, likelihood of drilling in and using screw extractors is minimal. Can't realign the gate, as it's one of a pair. My considered way forward is to junk the post and start again [can't reverse it as the masonry bolts were fitted to suit the old post, and aren't symmetrical]. Any suggestions on how to proceed other than this one?
Thanks

 

[big-all]

if you have any off the shaft showing use your drill chuck tighten around the shank and low gear slow speed

 

[foxhole]

Are you using a cordless or hand driver?

 

[LemurLes]

Thanks for the reply. Screws have sheared at the shank/head connection, beneath the gate hinge bracket, so aren't accessible. Screws were originally fitted with my cordless drill/driver, and this was used when they sheared. Can't drill small dia holes around the screws, as the hinge brackets are chunky cast metal.

 

[big-all]

i assume the bracket is a "U" shape so with all the screws removed the shanks off the broken ones stop it slipping off
can you take a picture ??

 

[Dave54]

If the hinges are chunky, can't you just shear the rest of the screws off (if they come out all well and good), and then move the hinges slightly? I assume you're going to move the hinge position anyway? Leave the broken screw in the wood, and just grind the stub off flush.

 

[foxhole]

Unscrew by hand, to much torque with cordless, especially if at wrong speed.

 

[LemurLes]

Thanks all
Put my dithering wimp brain to one side and attacked the lower hinge. Screw heads snapped, but there was enough slack [and post] to move the hinge over to lift the gate sufficient to sort out the drop.
Thanks again for the interest

 

[Burnerman]

If you want to be really sad like me, are the screw heads where they pass through the hinge necked slightly - showing corrosion? By no means uncommon and you've done the right thing - moving the hinges etc up a bit. A little grease on the new screws does no harm!
John

 

[big-all]

Thanks all
Put my dithering wimp brain to one side and attacked the lower hinge. Screw heads snapped, but there was enough slack [and post] to move the hinge over to lift the gate sufficient to sort out the drop.
Thanks again for the interest

thanks for taking the time to let us know how you got on it makes it all worth it

 

[LemurLes]

Thanks all.
Main thing I learnt is that turbogold screws ain't for being removed! I'll stick to bog standard woodscrews in future for this type of work.
Seems a bit odd that the shear strength is less than the 'bite' of the fluting on the shank.