marcros":kfnuvsxd said:interesting read, Scouse. I fancy having a go at a restoration of one of these, if I can locate a local one, ideally with 2 speeds.
Are the chucks similar to a modern drill?
Lee J":2hou06oq said:marcros":2hou06oq said:interesting read, Scouse. I fancy having a go at a restoration of one of these, if I can locate a local one, ideally with 2 speeds.
Are the chucks similar to a modern drill?
it just so happens my grandad handed me one down that he used to use in the motor trade in the 1950's. it's sat in my loft gathering dust and I work in leeds, hmmmm rubs chin
Here is another one, less attractive, but with balls too:condeesteso":3o9y8ocf said:here's another pic, kept it in a secret place...
bugbear":2ltkbt2g said:Here we go:
Looks like a drill with a flywheel on the quill, right?
But where's the feed?
Here we go...
The quill is threaded, and passes through the (also threaded) flywheel. Consider two extreme cases.
#1 If the flywheel stays still, and the quill rotates, the quill descends.
#2 If the flywheel rotates at the same speed as the quill rotates, the quill does not descend.
Here come the interesting bit; the quill also "supports" the flywheel a bit. If there's back pressure from the quill, the quill/flywheel contact (and friction) is increased, so the flywheel rotates more, leading to more of case #2
If the back pressure decreases, the flywheel rotates less, leading to more of case #1
In other words, the rate of descent varies inversely with back pressure. Neat.
The adjustment screw, visible below the flywheel, adjusts the friction between the quill and wheel.
In short, this thing is VASTLY more complex than it looks.
Edit; google gives:
http://www.gracesguide.co.uk/M._C._Gooding_and_Co
as the maker.
BugBear
AndyT":mcmsx6he said:Chucks are fairly simple things. You should be able to find something to unscrew to dismantle it. If it's a 3-jaw, a common pattern has three wedge shaped jaws, each with a blind hole on either side. Three compression springs loosely fitted into the holes push each jaw away from its neighbours onto the inside of the cone. The springs are about the size of those in a ball-point pen, which is one obvious place to look for replacements.
lica_mobilu":3rl53ftr said:Hello bugbear,
Can you please upload a photo of the yellow label on the crank wheel? I have just bought a pillar drill just like yours but the label is 95% gone.
Thank you,
Bogdan
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