Pole Lathe Grinder Add-on

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Pole Lathe Grinder Add-on

Postby Beornidas » Thu Feb 27, 2014 9:45 am

Dear fellow craftsmen!

For years I have enjoyed learning old and new techniques in woodworking, metalwork, etc from people who took the time to share their findings in their craft. This time I want to add a little grain of sand back, by sharing how to make a low-tech grinder that can be easily mounted to any pole lathe. For a while I wondered how to turn on one direction only a grinding stone on the pole lathe, but only till I looked at my bike I realized that the solution was close at hand. This design requires only an old rear bike hub with a freewheel and a grinding stone put together with a little tinkering (sketch attached below). You can make several of different grits and even a buffing wheel.

I used a rough Creusen stone (60grit, 15mm diameter hole.. pretty standard for power grinders) and quickly found a matching rear hub with a 15mm barrel. Also used a plastic wheel (from a wheelbarrow or cart) attached to a rear hub, on which I glued my old leather belt to polish my blades (as polishing compound I use beeswax and the particles remaining after sharpening on japanese waterstones). I can imagine any old grinding wheel from the flea market will do and also the finer Tormek stones, yet haven't tried those. You can grind dry or wet (no engine to mess with) and you can build a tool rest for sharpening, yet i enjoy doing it freehand. Hope you can find your own uses and expand this idea! Enjoy!

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Video of Grinder in Use: http://vimeo.com/61643643

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Re: Pole Lathe Grinder Add-on

Postby Robin Fawcett » Thu Feb 27, 2014 10:30 am

Nice one Beornidas - where are you? Obviously not in England as we've had no snow...
I have seen this kind of rig before but the wheel was just slid onto a gently tapered mandrel and mounted on the lathe.
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Re: Pole Lathe Grinder Add-on

Postby Beornidas » Thu Feb 27, 2014 10:49 am

Hey Robin!

I'm writing from a little field-house in the south of the Netherlands, doing woodwork/blacksmithing and some bike messenging for a living... and no snow this year either, mildest winter I had in europe so far.. but the pictures are from last years harsh and long winter... have been using the grinder for a while, but just now that its tested thought of making a drawing. I try to work fully without electricity and a powerful grinder (hand-powered is too slow and takes a hand away, foot power is good enough) is utterly necessary to enjoy forging and also bringing back to life old abused high quality tools. And as I often make wooden parts for bikes, it was time the bike helped me out on the lathe.

The rig you saw... did it also have a freewheel or just a stone and a mandrel that brakes less in the re-bounce than with the push of the leg?

Greetings from maastricht - Philipp
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Re: Pole Lathe Grinder Add-on

Postby Bob_Fleet » Thu Feb 27, 2014 12:12 pm

A great modification.

Here's an old post using a bicycle wheel and the chain to get continuous drive.

This is the thread with my attempt years ago but without the freewheel.
Yours is a great impovement and it means you can use a larger stone too.

Looking forward to the non reversing mandrell next.
Oh, there was a wooden one in a posting somewhere, three wooden cylinders in a frame I think.

Nice work Philipp
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Re: Pole Lathe Grinder Add-on

Postby Beornidas » Thu Feb 27, 2014 4:10 pm

Thanks Bob!

Very ingenious designs! The first one is quite elaborate and has a certain beauty to it, yet I love the simplicity of a stone directly attached on the pole lathe (the less tools/gadgets the better.. and as turners we already have a lathe). Great take with the mandrel... and indeed a wooden system that engages only on one direction will free turners once and for all from industrial dependance :) Well, at least as long as it remains simple.. still got a life to figure it out.

Curious about the three wooden cylinders?!

Saludos!
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Re: Pole Lathe Grinder Add-on

Postby ToneWood » Sat Mar 01, 2014 9:54 pm

Interesting idea. I've been looking for suitable axle (and, ideally,treadle arrangement) for an old stone wheel about 10-12" diameter. This is the simplest design I have come across so far:
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Re: Pole Lathe Grinder Add-on

Postby Bob_Fleet » Mon Mar 03, 2014 5:51 pm

Beornidas wrote:Curious about the three wooden cylinders?!

Found it, I knew I wasn't really losing it. I'm now covered in dust from the darkest recesses of the workshop but worth it.
Might have another bash at making one.
It's in the Bodger's Gazette, Spring 2011, issue 80 and called "The Slidy Mandrel" by David Mann.
I don't know if the editor has the pics and could post them or put the article up as a web page.
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Re: Pole Lathe Grinder Add-on

Postby Davie Crockett » Tue Mar 04, 2014 6:59 pm

Here's the link to the thread on one way mandrels: https://www.bodgers.org.uk/BB/viewtopic.php?f=14&t=2521&p=20315&sid=14a8ceb38b8353ba9d54fdcd650c32c5&sid=14a8ceb38b8353ba9d54fdcd650c32c5#p20315

I have to say that the bike sprocket mechanism is very efficient but it needs mass to keep the work turning enough to cut . (Not a problem with a largish grindstone I suspect), and it is annoyingly noisy (imagine freewheeling your bike with the sprocket next to your ear hole!). I have abandoned it as it's distracting.
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Re: Pole Lathe Grinder Add-on

Postby jrccaim » Wed Mar 12, 2014 4:30 am

Nice one, Beornidas. It works, of course! With a grinder it is not so necessary to have as fine a hand on tool withdrawal as on a pole lathe. Metal is indifferent to direction of rotation. hand-operated bowsaw

Somewhere in one of Roy Underhill's books is a reciprocating bandsaw also powered by a pole. The advantage, says Roy, over a conventional hand-bowsaw is dubious. Never tried it, I am neutral. I suppose you could even make a reciprocating wood (spindle) shaper).

Leonardo da Vinci is usually given credit for inventing a crank-and-flywheel continous motion lathe. I would not for a moment denigrate Leonardo; he was a genius for sure. But once you have that, you have continous motion. Big difference.
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