MadModder
Gallery, Projects and General => Project Logs => Topic started by: doubleboost on July 20, 2013, 04:23:29 PM
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Hi
Lads
I am going to build a dividing head
As described in
The Amateur's Lathe
by
L.H.Sparey
I will be doing some video as I well
Made a start on the pattern for the base
This is slightly larger than the one on the book as my Boxford has a higher centre height ,than the Myford 7 it was originally built for
(http://i261.photobucket.com/albums/ii63/john970s0/IMG_4951_zps1b63c7fe.jpg) (http://s261.photobucket.com/user/john970s0/media/IMG_4951_zps1b63c7fe.jpg.html)
(http://i261.photobucket.com/albums/ii63/john970s0/IMG_4950_zps5e14b158.jpg) (http://s261.photobucket.com/user/john970s0/media/IMG_4950_zps5e14b158.jpg.html)
(http://i261.photobucket.com/albums/ii63/john970s0/IMG_4948_zpsae4917ab.jpg) (http://s261.photobucket.com/user/john970s0/media/IMG_4948_zpsae4917ab.jpg.html)
(http://i261.photobucket.com/albums/ii63/john970s0/IMG_4956_zpsb0e672cc.jpg) (http://s261.photobucket.com/user/john970s0/media/IMG_4956_zpsb0e672cc.jpg.html)
(http://i261.photobucket.com/albums/ii63/john970s0/IMG_4954_zpsaac31c9a.jpg) (http://s261.photobucket.com/user/john970s0/media/IMG_4954_zpsaac31c9a.jpg.html)
John
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I've ordered the popcorn in readiness!
Andy
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Looking forward to this John
John
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Nice one John! :thumbup:
David D
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Feet up, popcorn ready, fridge moved within reach.... And the cat is allready in my lap.
Holding my breath....
Kjelle :lol:
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When does the movie start? :)
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Will we see the return of . . . . . " Bastard" John ?
Mike
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Goodo John Just what I need a step by step instruction video :nrocks:
Will be watching avidly. I made a start but the casting will be great to watch. I assume it will be cast in ali?
Pete
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Exellent, I love watching your videos John.
In fact you are the main reason I joined here in the first place.
Can't wait for the next installment :)
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Nicely shown, John. Only three ba5tards and one sh1t. Almost U Certificate, suitable for children.
Will you be coming round with a tray selling ice cream during the interval?
Andy
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That's the first time I have seen a reamer used on mahogany , in 50 years as a carpenter and joiner learn somthing every day .
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wow john and no coveralls....needed sunglasses to protect the eyes from the flash off the legs. :)
Nice start to the show. I've got the drinks and popcorn and a comfy chair so go for it. :proj: :nrocks:
Pete
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Hi John,
You have chosen a good subject for your video, sooner or later most dedicated casters and machinist find they need a dividing head, and this one requires no dividing plates. Like the pattern making video, will you be casting it in aluminium?
I fabricated one years ago to Alan Timmins design, when building his longcase clock. The center height was only 3 inches,
had to cast some 3 inch blocks to raise the head and tailstock to meet my current needs.
Cheers David
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Great stuff as usual. Now I know why you always wear a hat!!!! :wave:
How did you produce the semicircular bits? Did you band saw them and finish on the disk sander?
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I'm in for the show! I also purchased Sparey's book with the intention of building the dividing head.
Lead on John!
Chuck
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well dun john :thumbup:
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I really enjoy pattern making, so it's fun watching you put this together. Even though you say you don't like wood work, you are doing a good job, and with hardwoods, too. :thumbup:
Excellent job of showing how a split pattern can be built and keyed together. And of course, always fun to watch your videos, John. :clap: :clap: :clap: :clap: :clap:
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John
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oooh the morning show.. *coffe is ready* :ddb:
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yay, some great wood bothering skills John :)
gonna be a fair few parts long this project, looking forward to the next installment now.
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Have a dumb questions.. But why not make patterns out of foam and just paint the foam? That blue foam stuff for isolating concrete floors should standup to the ramming of the sand i figure. And its cheap, light weight and can be formed with a nailfile if out of wood tools.
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Great videos, John. I'm learning a lot about pattern making. What metal will you be casting in?
Chuck
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Have a dumb questions.. But why not make patterns out of foam and just paint the foam? That blue foam stuff for isolating concrete floors should standup to the ramming of the sand i figure. And its cheap, light weight and can be formed with a nailfile if out of wood tools.
I've wondered that a time or two, but actually find wood easier to work and finish. I think the problem with foam isn't necessarily that it would crush, but that it would move/compress/expand under ramming pressure and the sand is probably not going to like that. Also it might be ticklish to extract the pattern -- what do you screw into?
Finish would need to be a lot more extensive than just paint. There are some proprietary hard sufacers -- used for stage props, I believe, but you get into money there, plus lots of finish work.
Theory and thought experiments must always take back seat to reality., though,and I haven't tried it. So can't really say yes or no to it. Unless hard surfaced, I imagine it wouldn't last long, though.
Of course there's lost foam casting, which is altogether different. I've done that with aluminum, and believe I wrote something about it somewhere on this forum a while back.