Which cutting fluid?

[SVJC]

anyone know of a good cutting fluid? I need it to help me remove a sheared bolt.

cheers jc

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[yorkie_chris]

I like trefolex

[SVJC]

where can you buy that?

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[yorkie_chris]

Asking me where to buy cutting fluid in Cornwall? How mobile a mechanic do you think I am lol.

Try an engineers merchant or an industrial oil supplier.

[SVJC]

lol worth a try.

ok cheers i shall do that

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[dirtydog]

Asking me where to buy cutting fluid in Cornwall? How mobile a mechanic do you think I am lol.

That's not very mobile then is it YC ;)

[Bibio]

if your drill bit is not cutting it's blunt and no cutting fluid is going to help. if you blunt the drill bit doing the job your doing then the speed is to fast. if it's a large bolt drill a pilot hole first.

[SVJC]

am i right in thinking that cobalt drill bits are best suited to this job? i was hoping that the fluid would make it just abit easier to drill as i can imagine its going to take a while

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[yorkie_chris]

No just get good quality HSS dormer/presta etc.

[Bibio]

No just get good quality HSS dormer/presta etc.

+1

[SVJC]

cool cheers

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[embee]

Unless you're doing serious machining you can "get away with" using fluids other than specific drilling/cutting/tapping oils. Yes they are intended for the job, but not absolutely essential. I have some CT90 which works fine on most general purpose stuff I do, like this (http://www.ebay.co.uk/itm/CT-90-Cutting-Tapping-Fluid-Aerosol-Spray-1-x-500-ml-Drilling-Hacksawing-Metal-/321015875795?_trksid=p3284.m263&_trkparms=algo%3DSIC%26its%3DI%26itu%3DUCI%252BIA% 252BUA%252BFICS%252BUFI%26otn%3D21%26pmod%3D290438 453395%26ps%3D54) except it's a bottle not aerosol.

For mild steels you can use a thin mineral oil, like 3-in-1 or similar, aluminium likes paraffin or one of the few good uses of WD40, brass and cast iron you usually do dry. It's used to stop the tool overheating and prevent welding/pick-up on the cutting edge (I remember drilling a block of lead once without oil, ended up with a large lump welded on the end of the drill bit).

If a drill isn't cutting well it's because it is blunt, as the others say. It's worth digging out a table of cutting speeds for different materials/diameters/drill bit spec, something like here (http://www.toolsandmods.com/library/drilling-speeds) just as an example, plenty of others available if you search. Gives an idea of what sort of speeds are suitable.

[phi-dan]

You could try Macsalvor's in Pool, if you still need the proper stuff. They tend to have most things you never thought you'd need but just have to buy!

[SVJC]

i never even thought of going there at all.

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