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Old 07-15-2005, 12:18 PM
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multimachine -- DIY open source machining

Just saw this today -- I'm wondering if anyone has seen these around the net or has experience with them, or something similar to them.

From: http://www.multimachine.net and the multimachine Yahoo group

Quote:
Take: 2 old engine blocks, 2 pieces of pipe, 4 import bearings, some steel plate and a $69 crossfeed table.

Add 2 hours of machine shop work and a few minutes of welding, drill a whole bunch of holes and end up with an accurate metal lathe (with an up to 2 1/2" spindle bore) that also end and horizontal mills, drills or bores in 3 or 4 ways, chop saws, surface grinds, spins and can be a cheap and rigid CNC platform with all these functions.

It's rigid. The MultiMachine uses 2 full size engine blocks solidly clamped together with 1/2" x 12" steel plate and (4) 3/4" clamp bolts. This makes it almost "chatter" proof but is still easy to dis-assemble into managable pieces. The built-in "crane" makes re-assembly simple.

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Old 07-15-2005, 12:27 PM
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It may work, but the first thing I see, if someone hasn't been around lathes and mills or done any machining this a accident waiting to happen. IMO
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Old 07-15-2005, 05:58 PM
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I agree with zonk. Those exposed belts and shivs look kinda dangerous. Plus, if you have the machines to do the work, you probably don't need it........

tom
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Old 07-16-2005, 03:58 AM
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There doesīnt seem to be enough base to it, looks like it could topple.
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Old 07-16-2005, 05:47 AM
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That looks cool! I'm going to have to try that.

Belt guards? The drive mechanism looks like it's all in the back where you'd only be if you were changing speeds. Could put a spring latch cover over them pretty easily.

Those legs attached to the lower engine block appear to reach out far enough to keep it from being tipsy. It may rely on mass to keep it from being knocked over by a person. It could be bolted or welded to a larger, flat base, just as a drill press or weight-lifter's squat rack.
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Old 07-16-2005, 10:46 AM
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located in palestine tx. ..... thats just up the road from me.... dast i check it out?
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Old 07-16-2005, 11:19 AM
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You are appointed

Quote:
Originally Posted by crazy larry
located in palestine tx. ..... thats just up the road from me.... dast i check it out?
You are hereby appointed to the official check it out mission..

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Old 07-16-2005, 07:08 PM
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Looks like one of the machines we rigged up to machine the 30 ft diameter head cover on a hydro electric turbine case, yea it was dangerous to operate. This is what happens when machinists don't get enough lovin at home, they create doomsday devices in the garage late at night.
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Last edited by 4 Jaw Chuck; 07-16-2005 at 07:18 PM.
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Old 07-17-2005, 12:08 AM
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Quote:
Originally Posted by 4 Jaw Chuck
This is what happens when machinists don't get enough lovin at home, they create doomsday devices in the garage late at night.
Or they play with their worm......hole.
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Old 07-17-2005, 12:57 PM
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Quote:
Originally Posted by BstMech
Or they play with their worm......hole.
Ummm...no comment.
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Old 07-17-2005, 03:34 PM
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I've got to make me one of those.


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Old 07-18-2005, 06:04 AM
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Quote:
Originally Posted by malc
There doesīnt seem to be enough base to it, looks like it could topple.
You might want to let the guy know your ideas. It looks like it tried to get him while he was building it.

From message #143 at http://groups.yahoo.com/group/multimachine/message/143

Quote:
From: "Pat Delany" <rigmatch@...>
Date: Mon May 9, 2005 6:19 pm
Subject: Listen up everybody. BE CAREFUL!

Before you start to build one, please read the "How to build one" file
very carefully. Read it line by line and be sure that you understand
every word (THAT'S WHY I SELL THE VIDEO and a longer set of
instructions!). Build it however you like but please "learn" the file!
Think about how you are going to do every single step before you start
the first one. Why? Your machine may easily end up weighing 1000 lbs.
and it is EXTREMELY TOP HEAVY! Think "swat you like a fly!" It almost
seems like it has a mind of it's own and will TRY IT'S BEST TO KILL
YOU! Mine got loose several times and one time knocked me through a
window,frame and all! Serious knee surgery resulted and could have
been much worse if you know what I mean.

Pat
Why wouldn't you start by bolting that bottom engine block (a 4-banger) to something like a double layer of 3/4" plywood? That block must have plenty of tapped holes in the end and a sheet of 3/4" plywood can be bought for around $20 - $25. That would give it a base of 48" x 48" x 1-1/2" thick. My son's squat rack is bolted to a single layer of plywood, is much taller than that machine, has a higher top-to-bottom weight ratio (but lower total weight, of course) and yet would require a winch or hoist to topple it. You shouldn't be able to get the center of gravity outside the base.

Another way to make it more stable would be to extend those legs some and then connect the feet with scrap pipe. I don't like those spaces between the feet where it would be easier to tip than if pushing in-line with the legs.

Bolts could be used as adjustable feet around the perimeter of whatever base is used, to compensate for an uneven floor. It would be: bolt head, adjusting nut, base, locking nut.
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Old 07-18-2005, 06:31 AM
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I would put it up against the wall and bolt the top of it to the wall.
One engine block set on end is pretty stable bolt another on top and it would be dead easy to push over. Adding the table and any heavy workpiece makes it worse.
I was working on vertical mills when an apprentice, I was bringing the table up to the tool (my first job alone) which was revolving slowly.
It was taking forever so I engaged the boost lever which smartened up the pace, but in a moment, brain went out and I was looking at all those levers thinking which one of you buggers stops this ?
The workpiece ground into the tool and the whole skyscraper machine shuddered and out of nowhere the instuctor appeared and casually pressed the emergency stop.
I donīt mind all the stuff associated with tin bashing but lathes, mills etc give me the willys.
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Old 07-18-2005, 07:08 AM
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Quote:
Originally Posted by malc
[. . . snipped . . .]
I donīt mind all the stuff associated with tin bashing but lathes, mills etc give me the willys.
I've managed to keep all my body parts (except relatively minor chunks of skin) through years of woodworking by having a good imagination. If you can imagine what that spinning cutter will do when the work hits it or it hits the work and also imagine what would happen if part of you becomes the work or the target when the work becomes a projectile, you end up taking time to make sure it can't eat you.

There was an interesting link posted in that yahoo group:

http://www1.atwiki.com/gingery_machines/

Being able to cast and machine parts would be a very handy capability in restoring or hotrodding a car.
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Old 07-18-2005, 08:14 AM
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We were shown photos of what can go wrong, long hair, wearing rings, no safety glasses etc.
The woodshop where they made patterns for us tinbashers was the worst place.No one in there could hold up his hand to order five beers.
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