Thread: Is this a router bit?

It is a left handed drill bit for use with a multiborer. The screw can wound in or out to adjust the seating position of each drill bit so they all drill the same depth.

Originally Posted by Kuffy

It is a left handed drill bit for use with a multiborer. The screw can wound in or out to adjust the seating position of each drill bit so they all drill the same depth.

So, given I don't have a multiborer, useless to me?

yeah pretty much. The right handed bits can be used in a drill press though they often have a small flat ground onto the shank to register a grub screw. The small flat makes it difficult to mount in a standard drill chuck, but not impossible.

Originally Posted by Kuffy

It is a left handed drill bit ...

Sounds like the sort of thing you'd send the new apprentice out for. Mind you, if he came back with that you'd have to give him points for initiative. I'd never heard of such a thing.

Originally Posted by AlexS

Sounds like the sort of thing you'd send the new apprentice out for. Mind you, if he came back with that you'd have to give him points for initiative. I'd never heard of such a thing.

A multiborer is as the name suggests, a device for drilling multiple holes in one action of a machine, often a drill press or a hinge borer.

Typically has one input spindle and as many output spindles as the purchaser wants. The input spindle goes through the multiborer and becomes the central output spindle, but has a drive gear within the multiborer mechanism. There are a series of additional output spindles along the multiborer, with each having a gear that is driven from the the one adjacent and nearer the input spindle, and also driving the gear on the next one toward the end of the rig.

Assuming say that you are drilling a set of 11 shelf pin holes in a cabinet side, the input spindle would be the middle output spindle (#6) and would directly drive the two output spindles either side (#5 and #7) in the reverse direction, requiring a left hand boring bit as above. Those two spindles would directly drive the two spindles outboard of them (#4 and #8) in the normal direction using a right hand boring bit, and so on. If the user requires a gap in the drilling pattern, they simply remove the boring bits where they don't want holes.

Basically one powered spindle bores a number of hole in one movement. Cheapest versions tend to be an accessory for a normal drill press but these tend to have issues with hole placement, industrial style tend to be a single integrated machine with table, fence, and multiborer head accurately located relative to each other to keep placement accurate.Holytek-HSA21-Borers_14264216.l.jpg

That’s not a router bit.

This is a router bit.

( Apologies to Crocodile Dundee).

H.

Video or it doesn't count

Originally Posted by AlexS

Sounds like the sort of thing you'd send the new apprentice out for. Mind you, if he came back with that you'd have to give him points for initiative. I'd never heard of such a thing.

Never heard of a left-handed drill bit?

LDADE094C-BD81-4F79-9806-3A4A76EE838E.jpg

Apart from a multi-borer, is there any reason you'd have a LH bit?

They can be handy for removing screws where the heads have stripped out

My ones are HSS metal cutting drill bits; exactly the same as normal RH bits but ground on a left-hand helix. Their primary purpose is for drilling out broken studs; often the drill alone will remove the stud as it bites in. Used in a cordless drill/driver with the clutch set at its maximum torque it’s extremely effective. Otherwise when the hole is deep enough a screw extractor is then hammered in and the stud removed the old-fashioned way.

They would be handy for boring a hole from or through the headstock of a wood turning lathe.

Jim

Originally Posted by powderpost

They would be handy for boring a hole from or through the headstock of a wood turning lathe.

Jim

Only if your lathe is running backwards...

Originally Posted by Wongdai

I got a number of these some years back for an auction (a furniture maker was closing down),

IMG_20200216_084954.jpg

I use the same type in My Brookman doweler. There would be plenty of different makes of machines to take them . How many do you have and what diameter ? They come in common dowel sizes imperial and metric.

3 bits spin at once . Two left and one right , or is it two Right and one left ?
Its a head that spins the three at once and with the tap of my foot on a foot switch the Air powered head comes forward to drill the three holes at once. You take bits out if you want two or one hole at a time . Nifty machine .

They had the options of extra heads that spun thee or more bits in differing configurations . Like an L pattern with three holes, two holes vertical and one out to the right horizontal . Or the other way , one out to the left Horizontal .
The three in a row covers all furniture pretty much .

Good machine for fast joints in things like stool, chair or small table construction when your doing long runs.

540x360.jpg I got the pics of the net . Had a video of my one running somewhere but I deleted it I think ?

540x360a.jpg

Rob