RSJ is Rolled Steel Joist
Which Drill for RSJ ?
Jan 20, 2023
Last reply: 3 years ago
37 Replies
Get a Dormer drill bit and use with cutting compound at the correct speed.
folk have said most of it, but 1 more thing: a carbide tipped multimaterial bit is the best option. These have twist drill geometry vut with TCT. Steel bits like hss or cobalt are a variable bunch & might or might not manage it.
They do fine when you use a good drill and use it properly.
What you want is torque, a drill bit hardened beyond the mild steel of the RSJ, and a bit of lubrication, and some time.
What mechanism is used to hold the drill in the chuck is irrelevant.
and a bit geometry capable of drilling steel. SDS bits are not, they are blunt stone crushers.
Errr, I don't think you meant to suggest "cutting compound" - unless you sell drill bits, of course ;-)
Joke is on you
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Builders cut several holes in RSJs where they bolted together for my brother's house. I didn't see them do it, but the circular cutouts were laying around afterwards, so it must have been some type of metal core borer, not a twist drill bit.
Andrew
Tank cutter?
Concrete ~ RSJ .Doesn't compute.
Maybe, you should say what it's made of.
Well as an RSJ is a rolled steel joist perhaps it's made of steel.
Quite common to use annular cutters with magdrills, with lubrication drip-fed through centre of cutter
that's lube, not really cutting compound.
Yes. They still need an initial hole to support the cutter.
On a multi-hole job I do the pilot holes first to save on tool changing aggravation.
>
Even WD-40 gets honourable mention.
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Paul
according to that air & water are cutting fluids :)
Mag drills - useful if you want to make larger holes in thicker steel but a bit OTT for half inch.
While many will use the term lintel - I find it less common for people to actually specify the type unless they are better informed than the average man on the Clapham omnibus.
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