MadModder

The Shop => Tools => Topic started by: PeterE on July 04, 2013, 08:23:19 AM

Title: PeterE's C3 Hand Crank
Post by: PeterE on July 04, 2013, 08:23:19 AM

Another little item made while waiting for my left arm heals properly. Just a simple hand crank for my C3 this time.

Two items to turn after hack sawing the bits from the stock, and a longish M6 socket head screw. Together they make up an extension to the spindle onto which I can fit a crank.
(http://i577.photobucket.com/albums/ss219/H0n3/Tooling/C3-HandCrank/SpindleHCrank-03.jpg)
Traditional construction working well.

The crank itself came as a salvaged part from a very old two-speed hand drill with this particular purpose in mind.
(http://i577.photobucket.com/albums/ss219/H0n3/Tooling/C3-HandCrank/SpindleHCrank-04.jpg)
The two together makes for a very easily attached hand crank, and as the crank is secured to the spindle extension by a thumb screw, it will be extremely easy to remove to run the lathe by motor.

CAUTION!
DON'T EVER RUN THE LATHE WITH THE CRANK FITTED!

(http://i577.photobucket.com/albums/ss219/H0n3/Tooling/C3-HandCrank/SpindleHCrank-05.jpg)
I made the extension long enough so that I could keep the change gear cover on.

BR

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: DICKEYBIRD on July 04, 2013, 10:22:31 AM

Very nice Peter, well done!  I made one (quick & dirty, not nearly as elegant as yours) for my lathe a few years ago and have used it more often than I ever thought I would.  It's great for parting off hard stock when nothing else works to stop chattering on a light lathe.  Slow but effective!

Title: Re: PeterE's C3 Hand Crank
Post by: andyf on July 04, 2013, 11:08:35 AM

My spindle is 20mm bore, and I had some 20mm PVC rod, so I drilled it through, and put a taper in one end. With a long bolt into a matching cone nut, it expands to a good grip even without slits.

Peter, I try to remember to unplug the lathe when I'm hand cranking, to stop myself starting the motor and suffering whacks on the elbow from the crank handle as the lathe attempts to turn somersaults. For years, I've been meaning to substitute a wheel for the crank to introduce a bit of balance; something like 6 - 8" diameter, maybe off a child's discarded ride-on toy with a rubber or moulded plastic tyre for grip.

Andy

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 04, 2013, 12:43:21 PM

Dickeybird,

Thank you for kind comment. Also good to know that it aids in tough parting off situations.


Andy,
Thank you also to yuo! Intersting to learn that PVC works just as good as a slit sleeve.

Then about substituting the crank for some sort of wheel. What comes to mind is a suitably large V-belt pulley and one of those foldable handles. That way you can fold in the handle away from whacking position.

BR

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: andyf on July 04, 2013, 01:21:54 PM

A pal of mine has done a folding one, Peter. Pics here: https://plus.google.com/photos/112848589944601328801/albums/5888428873661904561#photos/112848589944601328801/albums/5888428873661904561

I suppose the handle would benefit from a spring so it folds automatically when you let go of it, and that would complicate things a bit and make it more awkward to use, if it folded itself each time you took your hand off it.

Andy

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 04, 2013, 03:25:42 PM

Yes I see Andy. (The link is slightly faulty. There is a "> and a space" in the middle breaking it.) But I would rather do it like a scaled up version of this handle shown in Arc Eurotrades offering: http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/Machine-Handles (http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/Machine-Handles) (scroll down to the bottom.)

Then I would avoid any chance of any kind of arm being possible to whack in a radial way.

Such folding handles are readily available.

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: andyf on July 04, 2013, 04:46:18 PM

Sorry about the link, Peter.

Some folding handle ones shown here http://www.elesanow.co.uk/series/1/2/Solid-handwheels/ , where clicking on the pics reveals larger diameters are available.

Andy

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 04, 2013, 05:45:55 PM

No problems with the link Andy, it just happens no worries.

Regarding the crank and handles I think we have the same ideas. Nice handles with that company.

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: NeoTech on July 05, 2013, 02:23:50 AM

Need to make one of those for threading.. *another tool for the project list*  :coffee:

Title: Re: PeterE's C3 Hand Crank
Post by: mechman48 on July 05, 2013, 03:18:42 PM

Here's one I made last week end: bits from the odds 'n' sods box & a handle from a book binding machine I had laying around in one of my boxes:

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 05, 2013, 03:23:09 PM

Well done George  :thumbup:

Yours seems to be a bit larger than mine.

BR

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: mechman48 on July 05, 2013, 04:17:32 PM

Thanks Pete  :beer:
Did have a smaller handle on originally..6".. but found that when I was threading some 12mm it took some turning, maybe it was additional drag of the belt & change wheels so as I didn't want to take off the belt & swing the banjo out I decided to increase the length to gain more turning moment & this was all I had to hand, so on it went.. worked a treat..  waste not want not I always sez  :dremel: 

Cheers
George

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 06, 2013, 04:48:40 AM

Ah, I see. The content of the good to have box is amazingly useful!  :thumbup:

BR

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: Meldonmech on July 06, 2013, 06:35:38 AM

Hi Peter.

                I have used this idea for holding an indexing plate, attached to the headstock, and for a leadscrew handle.

                                                Cheers  David

Title: Re: PeterE's C3 Hand Crank
Post by: PeterE on July 06, 2013, 08:57:35 AM

Hi David,

Same here, although I am re-doing the gear bit to include a back stop as well.

(http://i577.photobucket.com/albums/ss219/H0n3/Tooling/HeadStDivAtt-V1-01.jpg)

BR

/Peter

Title: Re: PeterE's C3 Hand Crank
Post by: krv3000 on July 09, 2013, 05:14:13 PM

good job well dun