make a jig for cutting 1/4"ridges inside pvc pipe - Router Forums
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post #1 of 20 (permalink) Old 03-16-2017, 04:48 PM Thread Starter
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Default make a jig for cutting 1/4"ridges inside pvc pipe

Just want to throw out a request for ideas on a problem I'm having......I want to make a jig for cutting 1/4"ridges inside pvc pipe for making a reverse helix trommel barrel out of 8"PVC pipe for my wild hobby of gold prospecting? I know what my end result should be, but can't "see" how to do it in my head to build a jig for it? Any thoughts out there........

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post #2 of 20 (permalink) Old 03-16-2017, 05:03 PM
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Originally Posted by wilfor03 View Post
Just want to throw out a request for ideas on a problem I'm having......I want to make a jig for cutting 1/4"ridges inside pvc pipe for making a reverse helix trommel barrel out of 8"PVC pipe for my wild hobby of gold prospecting? I know what my end result should be, but can't "see" how to do it in my head to build a jig for it? Any thoughts out there........

Bill
Bill do you have a picture of what you are trying to do, or is his an original idea?
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post #3 of 20 (permalink) Old 03-16-2017, 06:08 PM
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need more to form ideas...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #4 of 20 (permalink) Old 03-16-2017, 06:33 PM
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Just from watching Gold Rush on TV, I think you are talking about bars the are straight down the pipe, is that correct? If so, and if the pipe isn't too long, you might be better off attaching strips to the inside walls of the PVC.

You must be using something like the thick wall pipe used for smaller mains.

If you made the strips of plastic, you could lightly afix the strip to a piece of wood, apply the epoxy or glue, run the wood strip into the pipe with glue applied just before inserting it. Then flip the wood carrier over so the glue contacts the walls. Personally, I can't see this lasting very long.

The trommels on Gold runs have water sprays near the top of and running the length of the trommel. The water washes the gold and smaller gravel off the larger stones and gravel. This means there needs to be some sort of grill so the gold washes out of the trommel into the rocker where water flows and the gold settles into riffles or a mat. The picture shows the trommel as a metal, heavily perforated tube. So I'm not sure you can make a PVC tube do this. If I were doing this, I'd find some flat stock with openings in it, install the bars while it's flat, then have someone weld the thing into a tube. I think that would hold up for some time with moderate usage.

Looks to me like the trommel has to have open ends for rock going in one end and out the other, and wash water going in the tube at one end.

Looking at the picture below, I notice that the separated gold and smaller particles drop down to a box that flows the opposite direction, then dumps the paydirt onto the end of the rocker.

If you were going to do this with a PVC pipe, you could put in the bars, the drill a LOT of holes between the bars.

One last thought about the bars. Use some steel L bars, pre drill 3-5 5/16th holes to bolt it in place in the tube (Drill the center holes through the PVC from the outside of the tube), then drill the holes near the end where you can reach more easily. I'd use stainless bolts. Use a washer on the outside to reduce stress on the pvc tube.

I assume you will be running a generator and water pump, or prospecting where you have sufficient gravity flow. I'll be curious about how you rotate the trammel tube.
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post #5 of 20 (permalink) Old 03-16-2017, 06:53 PM
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Years ago I had a ton of info on placer mining. Making, and using, all sorts of gold machines. Worked with a young LT in Nam whose family panned on a big scale every summer. They used a dozer to push dirt into a large sluice box. Basically the K.I.S.S. principle, and it worked, they spent minimum time working on repairs.

Do a google search for reverse helix trommel barrel. You'll get tons of info on making, using, buying. Me I'd make one, if I wanted one. But from what I've read and all, think I'd pass on one.

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post #6 of 20 (permalink) Old 03-17-2017, 11:26 AM Thread Starter
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my pvc pipe is 8" od wide, 1/2" thick......just wanna cut a continuous 1/4" groove, 1/4" wide, spaced about 1-2" apart, the length of the pipe (about 3' long). There's a company out in California that would do it for about $300-$400. not counting shipping........too much money for that cuz its too much fun to try and make my own. That way if I mess it up/break it I'll know how to fix it, eh? I'm trying to attach a picture so this don't sound so silly, and I really appreciate all the help you all are giving me.....

Bill
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post #7 of 20 (permalink) Old 03-17-2017, 12:05 PM
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Approach step by step...

What can cut a 1/4" grove? Small trim router? Check to be sure. End mill or ball-end bit perhaps?
What mechanical action can move the router forward (or the pipe backward) as it rotates inside the pipe (or the pipe rotates around it)? It could wind up a cable as it twists, and as the cable gets shorter it pulls the router up the pipe. Size winding mech so each rotation pulls the router your 1"-2". Once a few threads are cut a pin could be dropped in so the router just advances up it's own thread.

Consider dust collection while cutting. Drag a vac hose up as the router climbs up the pipe.

Only ideas here. Expand on as necessary.

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post #8 of 20 (permalink) Old 03-17-2017, 12:17 PM
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If you are going length ways then one of the easiest ways to do it would be to split the pipe in half, cut the grooves, then solvent weld the two halves back together. The base of a trim router should fit far enough down into the trough to be able to cut that.
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post #9 of 20 (permalink) Old 03-17-2017, 01:18 PM
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Quote:
Originally Posted by Cherryville Chuck View Post
If you are going length ways then one of the easiest ways to do it would be to split the pipe in half, cut the grooves, then solvent weld the two halves back together. The base of a trim router should fit far enough down into the trough to be able to cut that.
Very +1...

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post #10 of 20 (permalink) Old 03-17-2017, 01:21 PM
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How about this...put a slice down the pipe...heat it until it can be opened and flattened...put it in a "press" for a while...route grooves with an edge guide such that the end of one matches up to the beginning of the other side...heat again into a circle...glue back together... VIOLA...

Welcome to the forum...
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