old french drill

[garyParticipant @gary44937]

got this old french drill today, does anyone have any information on it

Edited By SillyOldDuffer on 27/06/2023 21:07:22

[garyParticipant @gary44937]

[garyParticipant @gary44937]

bump!

[garyParticipant @gary44937]

finished restoring the old drill and now working out the best way to drive it

[Ady1Participant @ady1]

A nice job.

ooh la la

[noel shelleyParticipant @noelshelley55608]

Belt a citroen 2cv engine to it ? Noel

[bernard towersParticipant @bernardtowers37738]

Blimey Noel how big a holes do you need to drill?

[jaCK HobsonParticipant @jackhobson50760]

Beautiful. Jealous.

[VicParticipant @vic]

Nice Job.

[Nigel Graham 2Participant @nigelgraham2]

Mon Dieu! Magnifique!

Great to see it back in fine fettle and waiting for lots of holes to make.

Arranging a drive would be interesting. I have a similar problem with a small Denbigh horizontal mill so might we find solutions similar?

.

I suspect that drilling-machine was never designed to whizz round like a modern machine, probably no more than about 200rpm at most, and was almost certainly intended for line-shaft drive, as my Denbigh is – and that wants only about 70rpm at the spindle.

Do you have a matching pulley for that rather improbably overhung one? Flat belt material and clips are available from various sources, including I think Tony Griffiths (lathes.co).

Alternatively, and what I am working out how to do for the milling-machine, carefully keep the original pulley as part of the machine, but fit a modern one to its shaft. That might some simple mm size for which a "Taper-loc" or similar bush is available, though it would be easy enough to make a sleeve for it.

When I acquired the mill, its past (in more than one sense…) owner had built a confection of motor, old car gearbox and final-drive by chain, on an inelegant angle-iron frame above it. To carry the sprocket he had simply drilled and tapped a ring of small holes round one of the vertical faces of the spindle's original flat-belt pulley; and I may yet revise this arrangement.

I seem to recall someone on this Forum once suggesting a flat pulley will carry an SP-letter vee-belt but I may be wrong and I don't know how well or reliably it would work.

The problem I have with the mill and you don't see to with the drill, is that the driving-pulley is surrounded by the casting so needs either an inelegant drive from one side, or a link-belt or chain-drive from above.

[garyParticipant @gary44937]

thanks for the compliments lads. nigel, an interesting project you have there. i have a thee phase motor wired up to an inverter but slowing it down to 100rpm would leave me with no torque. the other option would be two sets of pulleys, there are very good pulley calculators on the net which you type in the sizes of pulleys which you have or can get and it tells you the final speed of your set up. i want to keep the flat pulley on the drill and here is what i need. 65mm pulley on the motor 230mm on a countershaft a 70mm flat pulley on the other end of the shaft which will drive the original 280mm flat pulley on the drill! i think this gives a speed of 98 rpm the easiest way to assemble this is bolted to the floor but this means i would have to slip the belt off when changing from using the slip on vice to the round table. there are no ball bearings or bronze bushes on the drill so you are correct about the speeds. there is a very interesting self down feed which i will show when i get it running. it came with two handles one for winding up the table and one for turning the drill! think i would need to eat plenty of porridge to try that carry on.

[Nigel Graham 2Participant @nigelgraham2]

Calculating the ratios is simple division, but those pulley calculators are valuable for giving the belt lengths for diameters and distances. I think I have one somewhere.

I have for my sins four hefty great Mod 3 spur gears that can be assembled into a back-gear type configuration giving about a 4:1 reduction on their direct-drive mode, and I have been toying with designs for that.

However it may a lot simpler to go for all-belt drive with a link-belt or chain for the final part, as the spindle pulley is surrounded by a lot of good honest cast-iron in one piece.

The motor I have a single-phase 1HP machine of 1400rpm (actually 1350 but using 1400 makes for easier sums).

So I need a total ratio of 20:1 for a cutter speed of 70rpm, a figure I gained from studying various text-books, with an option of, say, 140rpm for slitting-saws and drills. I'm tempted to use a single-way cone-pulley pair on the motor and first-motion shaft; or more safely just two pulleys so it will always drive downwards; then 65mm to a 250mm pulley I have in stock. So that's maybe 2: 1 then 65: 250 gives 182 rpm at the pulley above the machine.

++++

Talking of elderly French machine-tools…..

Many years ago I rescued from a scrap-yard a very ancient, very unusual, French-built, Huré Universal Mill. We set it up in the workshop the club rented then, and drove it from a 3ph 3HP motor from an ancient shaper the mill had replaced.

This was an odd machine. It had a double head, L-shaped in plan, that could be rotated on the column to bring into use either the vertical or horizontal spindle – followed by a lot of flat-belt changing to suit.

The spindle ended in a threaded nose with a large, coarse-thread nut like a pipe union, but with a finer thread through the smaller bore, to hold the tooling in a taper of unknown type. None of us knew how that was meant to work as it had come with free swarf but no tooling. So I made a threaded insert to carry a small lathe chuck to hold the cutters.

The thing was so hefty and had so many plain journals from motor to spindle that it took all the effort the poor motor could muster to bring it up speed!

it was never really much use to us and eventually I passed it on to Weston Zoyland Pumping-Station Museum. I understand it later went travelling again to a new owner. So at least I had saved the poor old thing. I hope it's now in use somewhere!

Huré later changed its name to Huron, and seemed to have been manufacturing machine-tools from the 1880s to the 1970s. Lathes.co shows my specimen to have been a type introduced in the 1890s.

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