Left handed drill bits?

[Teejayexc]

No not a wind up, they actually do exist apparently, unlike the infamous left handed screwdriver.

I have a dismantling project on the go and I just know there's gonna be some stuck screws/bolts so am thinking ahead in preparation for a change.

As anyone used them and can advise where's best to purchase from, also any reccomendations on makes/type etc.

Tia, Tj

[DarrenSV650S]

I got a cheapy set from lidls a while ago just in case. Only used it once on a bolt with a damaged head and it worked a treat :D That was just a small bolt though, I'm not sure how it would handle a bigger bolt.

[sv4me]

http://forums.sv650.org/showthread.php?t=162455 :mrgreen:

I've used the EZ-out stuff when the head got mullered on the swingarm bolt (at the front for attaching a hugger) quite flimsy things, apparently I was lucky as quite a few i've spoken to said theirs just snapped

[maviczap]

Prep everything with Plus Gas before even thinking about using these things.

Last resort jobbies in my book

[Sid Squid]

Left handed drill bits should be the first resort.

EZ outs is a plain wrong description - never have anything to do with them. If they work they weren't needed, whatever they're screwed into wasn't that stuck, they won't undo anything that's stuck they'll just snap instead.

I have seen some parallel sided varieties which are for a very specific purpose, and these would be better as they're less likely to wedge the broken bit in place - but they'd still only be the very last resort.

[yorkie_chris]

I got some from local engineers factors, made by dormer IIRC

[maviczap]

Left handed drill bits should be the first resort.

Even before Plus Gas treatment and trying to undo the offending item :rolleyes:

[Teejayexc]

Thanks for the info, will be trying to source a set of the left hand bits, do they look like normal bits or shorter stubby version?

I wouldn't put an EZ out within 10 miles of a broken/snapped stud/screw, years ago I tried one and ended up with half the bngger embedded in my palm after it snapped off half way into a job.

[maviczap]

Ah thats what I thought you were on about, EZ outs, not left handed drill bits

[Sid Squid]

Even before Plus Gas treatment and trying to undo the offending item :rolleyes:
:rolleyes:

:)

[tinpants]

surely what you are all on about are stud extractors and not left handed drill bits? I was always told that a left handed drill bit was a reamer?


Just my 2p.

[yorkie_chris]

No a reamer is totally different.

A stud extractor I suppose you could call the same, but they aren't by a long shot, a LH twist drill is literally a normal drill bit with the flutes going the opposite way around.

By the way bloody hard to sharpen, engage brain before activating grinder!

[tinpants]

So, do they cut like a normal drill bit then? If so, whats the difference between using a lefty or a righty? Is it because they are cutting in the "undoing" direction? Just that I've never heard of them and, I have to admit, had to check the date to check it wasn't April 1st!!!

[yorkie_chris]

Yes exactly like a normal drill bit just in reverse.

How it works it you remove material and when it gets to the point that the bolt starts to collapse a bit the cutting friction undoes it for you. It is very easy.


You could get the same effect by helicoiling all the threads on your bike with LH threads, then when they seize you could use normal drills :-P

[tinpants]

Well, as the saying goes, you learn something new every day. Kewl.

[Lozzo]

No not a wind up, they actually do exist apparently, unlike the infamous left handed screwdriver.

I have a dismantling project on the go and I just know there's gonna be some stuck screws/bolts so am thinking ahead in preparation for a change.

As anyone used them and can advise where's best to purchase from, also any reccomendations on makes/type etc.

Tia, Tj

I acquired mine in bits and pieces from tool shops and ebay. They've all lasted me years as they don't get constant use.

[Teejayexc]

Where do I buy some from in this country?

Went into Screwfix today and the geezers behind the counter pi**ed themselves laughing, they thought April 1st had come early, no amount of reasoning was gonna convince 'em otherwise, winkers !

Seen plenty for sale in the states but can't find a decent supplier here?

[Lozzo]

Go back in there with a Dormer catalogue and slap it on the counter in front of them, or point them to this link

http://www.amazon.co.uk/15pc-Left-hand-Drill-Bit-Set/dp/B000VDFNWG

[Sid Squid]

Or these: Ebay link (http://cgi.ebay.co.uk/25-PIECE-LEFT-HANDED-METAL-DRILL-BIT-SET-/350439078126?pt=UK_Home_Garden_PowerTools_SM&hash=item5197cbf8ee).

I've got few bits made by that company - good quality.

[maviczap]

Thread resurrection

I've snapped one of the engine mounting bolts on the left hand side (the short one, where its secured by the clamp on the frame). As usual it felt like it was releasing then snapped, I wasn't giving it much welly.

Anyone removed one of these before?

Going to get some of these drill bits, would cobalt ones be better?

[yorkie_chris]

Most fancy "cobalt"/"Ti"/unobtanium/whatever drill bits are at best a gimmick and at worst utter shi*e that's a funny colour.

I don't worry about best drill bits in world, but if you get them and they are presta or dormer ones you won't go wrong. The simply HSS ones take some beating and arrive out of the box sharp with nice even faces so they cut the correct size.

[maviczap]

Ta, I'd already found some Domer HSS ones on EBAY, I'll see if there's a local suplier first.

I know you need to have a drill that works in reverse to make them cut, but is it worth drilling a pilot hole first with a normal (RH) drill bit or starting off with LH bits and gradually stepping up the size until the remains come out or collapses.

I shall be treating the remains with some Plus Gaz before attempting this

[yorkie_chris]

Depends on the size of the hole.
In your case I would start at 3mm or so right handed.

Depending how good you are at getting centered, it might be worth getting one that's a snug fit in the spacer to get you a concentric spot to get going. Especially useful if the bolt has a rough end and you can't get in to clean it up and center pop it normally.

[maviczap]

Yes, its going to be tricky getting it centred easily.

I'll give it a few days of Plus Gas treatment first

[squirrel_hunter]

I've snapped one of the engine mounting bolts on the left hand side (the short one, where its secured by the clamp on the frame). As usual it felt like it was releasing then snapped, I wasn't giving it much welly.

I can't think exactly which bolt this is (I'm thinking front cylinder head), however how far in has it snapped? if its a bit further down the shank than just the head I would look at dropping the engine out and getting stud extractors on it.

[maviczap]

Yes, front cylinder head, near the CCT on the engine there's nothing for a stud extractor to grip & i'm not going anywhere near it with an Ezze Out

[squirrel_hunter]

Shame theres nothing for it to grip to then. Out if interest I presume you're removing the engine, what you up to?

[maviczap]

No, just removing the fairing lowers mounting bracket. Bleedy typical, should have been a straight forward job

[squirrel_hunter]

Hasn't the front bolt got a spacer on it, I presume you have removed that tube as well just in case there is enough to get mole grips on or something? Just trying any other suggestion I can think of as I've never had much luck drilling things out.

On the plus side the faring brackets off...

[maviczap]

No no spacer. Few days of plus gas and await LH drill bit and take my time.

Yes, at least the fairing bracket is off!

[squirrel_hunter]

No no spacer.

Are you sure?

Part 6 (http://www.robinsonsfoundry.co.uk/content/pages/shop/parts/Suzuki/SV/SV650/X%20Y%20K1%20K2%201999-2002/sv650xframe.htm) is a spacer for the front cylinder mounting bolt. There is a bolt that holds the spacer in the frame in a clamp (part 7) remove this and the spacer should slide out.

[maviczap]

Aye, I agree with that fische, but there was no spacer?

I'll explain that this isn't my silver sv, but another one I have, hence I can't explain why it hasn't got the spacer.

Makes sense as to whoever fitted the lower fairing, didn't refit the spacer

Think I'll order a spacer and bolt at the same time, unless anyone has got a spare?

[squirrel_hunter]

I see thought it was your silver one. Yeah should have a spare spacer and bolt if you want it?

[maviczap]

Yes please, let me know.

Not urgent