Green sand or Petrobond, no, I can understand why you wouldn't want to mess up your sand. However, there are folks doing it with plain sand, aerated with a blower until the pattern is sunk to where you want it, then the blower is shut off, and the sand locks the pattern in place. Haven't yet tried it myself, and once I do that may be the last time I try it. But it seems to me it would work well for particularly complex objects. Especially for folks who don't have great skills at wood working or pattern making. Like me. You do spiffy work, John, but I didn't start where you did, and I'm running out of time if I'm going to do some stuff I want to do, so I'm going to at least try some of the newer methods. They may be a waste of time, but maybe not. I'm never going to catch up to you anyway, but I may succeed in some of the things I want to do. And either way, I should learn some stuff, and have some fun!
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
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On Tuesday, May 5, 2020, 01:42:04 AM UTC, John Dammeyer <johnd@...> wrote: One of these days I'll get around to casting this mount for my harmonic drive. It pulls from the sand nicely.? Drawn with Alibre CAM. Fitted to the motor.? Then tapers and draft added and expanded by 3% for shrinkage.? Sectioned into 4 parts and printed as 4 pieces. Glued together, body filler, primer and paint. Absolutely no interest in stinking up my sand with lost PLA process nor lost foam. John -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Bill in OKC too via groups.io
Sent: May-04-20 5:47 PM
To: [email protected]
Subject: Re: Workshop Practice Series, was Re: [digitalhobbyist] Thickness reduction
If I ever get a printer that will print metal objects, I just might do that! My interim plan is to learn to print stuff I can use as patterns
for sand casting molds. I've got a number of projects hanging fire on my eventually learning how to design stuff for the 3D printer.
One advantage to doing the plastic patterns is that they can be simpler shapes, with machining done after casting. That can help
with making castings with the correct amount of shrinkage in the metal castings. I'm just wondering how many attempts it will take
to get parts that can be machined to specification. One day I hope to find out!
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
? On Monday, May 4, 2020, 11:26:33 PM UTC, mike allen <animal@...> wrote:
? ??? ??? make one with yer printer
? ??? ??? animal
On 5/4/2020 3:46 PM, Bill in OKC too via groups.io wrote:
I downloaded all of them I could find, and ordered the ones that I thought I could actually use in dead-tree versions, too. The only things I didn't order that way are the ones for wiring and motors, as the UK standards are so different from our own. and the
CNC stuff that I didn't have a real interest in at that time. Didn't get the Unimat books, either, since none of my machines are that
smal I know I'm a crummy programmer, so I'm trying to stay away from CNC, but I did get a 3D printer, so I'm trying to learn to at
least design stuff for the printer. If I ever trip over a Unimat, I know where to get some good books... ;)
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
? On Monday, May 4, 2020, 10:31:05 PM UTC, Bruce J <bruce.desertrat@...> wrote:
? I?ve gotten a couple as well. I was just quite surprised to find them on Archive.org?.
On May 4, 2020, at 1:40 PM, Bill in OKC too via groups.io <wmrmeyers@...> wrote:
It's not all of them, but it is all up to #39, which is pretty nice. I've got most of them. You can order them direct from the publisher
for (last I did it,) about $10-15 each, or though Amazon. I've bought a bunch of them, including both for the 7x mini-lathes, #43 &
#48, IIRC.
Bill in OKC
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Bill in OKC too