ChrisW
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| posted on 24/1/05 at 06:31 PM |
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Left handed tap & rod end questions
Is there such a thing as a left handed tap (the thing for cutting threads in tube, not the type for the sink) or am I missing some technique for using
them backwards? All the sets I've seen for sale don't state whether they are right or left hand thread.
Cheers, Chris
[Edited on 1/25/2005 by ChrisW]
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gazza285
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| posted on 24/1/05 at 06:33 PM |
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There is such a thing as a left hand tap, usually at great expense. What size are you after as I have a few.
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flak monkey
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| posted on 24/1/05 at 06:33 PM |
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Yes left handed taps exist.
See here for some:
http://www.uni-thread.com/tdmetric.html
Most sets you buy are standard right hand thread taps. Left handed ones tend to be specials.
Cheers,
David
Sera
http://www.motosera.com
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theconrodkid
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| posted on 24/1/05 at 07:17 PM |
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what you want to tap,friend runs an engineering shop,could probly run it up on lathe 
who cares who wins
pass the pork pies
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David Jenkins
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| posted on 24/1/05 at 07:37 PM |
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You could try Tracy Tools (do a Google) - they stock a huge range of taps and dies in all sorts of types and sizes. Their standard prices are for
carbon steel taps, then +100% if you want HSS, and/or +100% for left-handed (if available).
One hint - don't use a credit card... they don't like the surcharges from the card companies, so charge a high premium to buyers. Send a
cheque with your order and you'll get the tools return of post about 2 days later. A really good company to deal with.
David
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ChrisW
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| posted on 24/1/05 at 08:00 PM |
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Thanks for the suggestions guys. I'll have a measure up and see what I need. It's for fitting rod end bearings into tube (kind of like
Locost trailing arms) so I'm guessing M10 or M12 sort of size threads.
Chris
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marc n
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| posted on 24/1/05 at 08:05 PM |
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we use 1/2 unf r h and left hand threads on our wishbones for adjustment,
l / h taps tend to be really expensive the last one i bought was £64 i think
could make you some bosses up if that helps
going to 1/2 inch unf is easy as you only have to drill the wishbone bracket holes out .5mm
regards
marc
[Edited on 24/1/05 by marc n]
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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ChrisW
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| posted on 24/1/05 at 09:54 PM |
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Right guys, been looking at the rod ends in Demon Tweeks (although I guess there are better places to get them from).
For those that hadn't guessed, these are for replacement trailing arms for an XR2 track day car. They're just like Locost trailing arms,
except there is only one each side (the suspension strut keeps the axle upright)
The bush that this is to replace has an ID of 10mm which I guess is the deciding factor in which bearing I choose. The only 10mm ID bearing listed is
14mm wide, whereas the bush is 48mm. Do I just pack it out with washers or do I need a proper spacer?
Do I need to ensure the bearing stays at 90 degrees to the mount or will it hold it's own position?
Is 21kN 'radial static load' enough? Car weighs about 800kg
Finally, has anyone got an M10x1.5 left hand tap they would lend me? 
Sorry for all the questions. First time I've used anything as complicated as this!
Cheers, Chris
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Mix
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| posted on 25/1/05 at 10:38 AM |
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Nick Skidmore, (who posts on here) supplied me with a LH M12 tap to suit the rose joints I purchased from him. The tap was about £12 if I remember
correctly and of excellent quality.
Mick
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ned
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| posted on 25/1/05 at 12:11 PM |
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Nick also frequents the racecar forum i believe..
Ned.
beware, I've got yellow skin
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ChrisW
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| posted on 25/1/05 at 07:34 PM |
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Thanks for the recommendation guys, I'll look him up. Anyone comment on my other points?
Ta, Chris
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Rorty
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| posted on 26/1/05 at 05:04 AM |
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quote:
Originally posted by ChrisW
Right guys, been looking at the rod ends in Demon Tweeks (although I guess there are better places to get them from).
For those that hadn't guessed, these are for replacement trailing arms for an XR2 track day car. They're just like Locost trailing arms,
except there is only one each side (the suspension strut keeps the axle upright)
The bush that this is to replace has an ID of 10mm which I guess is the deciding factor in which bearing I choose. The only 10mm ID bearing listed is
14mm wide, whereas the bush is 48mm. Do I just pack it out with washers or do I need a proper spacer?
Do I need to ensure the bearing stays at 90 degrees to the mount or will it hold it's own position?
Is 21kN 'radial static load' enough? Car weighs about 800kg
Finally, has anyone got an M10x1.5 left hand tap they would lend me?
Sorry for all the questions. First time I've used anything as complicated as this!
Cheers, Chris
Hold on there Chris! You may be better off with a 12mm (or 1/2" rodend (it's impossible to say if the rod end is up to the task just from
the figures you quoted...many more factors involved), but a 10mm rod end for a trailing arm (radius rod?) sounds somewhat on the light side.
Are you sure the bush you're replacing is actually 10mm and not 3/8"? What are the markings, if any, on the bolt?
Either way, if you choose a 12mm or 1/2" rod end, you can then place a proper side spacer (some people call them "top hats" either
side of the rod end.
They are designed to protrude about half way inside the rod end so they don't dislodge and they will reduce the ID to 10mm or (3/8".
A pair of side spacers plus the width of the 12mm rod end (16mm) won't make up the 48mm that you're after, but you could pack the rest out
with washers. If it were me, I'd turn up some side spacers specifically for the job so you're not juggling a handful of washers when you
assemble/dismantle the thing.
At least going up a size you would have a larger rod end with a higher yield.
 
Rescued attachment Rorty_rodend_spacer.jpg
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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indykid
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| posted on 26/1/05 at 09:44 AM |
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just for reference, i have an M24 l/h thread tap, just incase anyone needed one.
it came from the harrogate show, in a 8 taps for a fiver deal. i couldn't find 8 i wanted so i threw in the grand daddy. its a good show
piece.
it might help someone, maybe
tom
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flak monkey
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| posted on 26/1/05 at 10:13 AM |
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quote:
Originally posted by indykid
just for reference, i have an M24 l/h thread tap, just incase anyone needed one.
it came from the harrogate show, in a 8 taps for a fiver deal. i couldn't find 8 i wanted so i threw in the grand daddy. its a good show
piece.
it might help someone, maybe
tom
Yeah, you just need the mother of all tap wrenches and a 6ft scaffold pole to use it... 
Sera
http://www.motosera.com
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