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Large parts tumbler in the works

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comeoutswingin
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Large parts tumbler in the works

Postby comeoutswingin » Mon Aug 15, 2016 4:41 pm

I've been designing this for a while now and I pulled the trigger on all the mechanical parts to build it last night. I'm hoping it works as planned but I wont know until I build it.... it always works in CAD right?
Tumbler 2.JPG
Tumbler 2.JPG (64.61 KiB) Viewed 1935 times


I designed it to be built entirely of .25". The barrel is 24" x .5" Wall pipe. The barrel is 48" long. Originally I was going to have an octagon shaped barrel bent up, but it was going to cost about $200 additional after materials and labor, so I went with the pipe and I will weld fins to the inside.

The rollers are 6" heavy duty caster wheels. I am using a 3/4 HP electric motor to a 20:1 gear reduction box. From there it will be chain driven with even further reduction. I am right now at 14-17RPM. This can be changed easily by swapping the sprockets. I'm hoping I can cut the large sprocket good enough to make it work. We'll see. The small sprocket was so cheap I didn't bother making my own. I am going to use #40 chain.

The ring in the inside of the barrel is going to run between two caster wheels. I am hoping this is enough to located the barrel without additional hardware. I do have a back up plan.

2.JPG
2.JPG (38.37 KiB) Viewed 1935 times


I haven't totally settled on the door yet. My current plan is to use some threaded handles to secure it to the tumbler. I am going to be doing large parts in this so it needs to be on there good.

Barrel Assembly.JPG
Barrel Assembly.JPG (22.39 KiB) Viewed 1935 times


So that's where I am at today. Any ideas?
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Tumbler.JPG
Tumbler.JPG (26.71 KiB) Viewed 1935 times
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DLE
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Re: Large parts tumbler in the works

Postby DLE » Mon Aug 15, 2016 5:05 pm

I'll put in my two cents.
We built a tumbler last summer, first project we did with our press brake. Built an octagon tank, cut a large door in it, etc. It runs off of a pipe that runs the length of the tank, with a 72 tooth sprocket welded on the end. It's all sealed with some edge trim from mcmaster carr (cheap) which is great to keep the rain out - ours sits outside 12 months. The cut in door makes it so nice to be able to reach all the parts, as opposed to trying to get them out from one end. We had built a small cheesy one out of a 55gal drum before hand and learned alot. I would never build a round one again, the octagon shape lends itself so well to tumbling parts.

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Re: Large parts tumbler in the works

Postby Capstone » Mon Aug 15, 2016 5:36 pm

subbed.
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Re: Large parts tumbler in the works

Postby mdwalker » Mon Aug 15, 2016 5:59 pm

I built one a few years back but used lawnmower parts. The barrel was very similar to what you have pictured but I used the gearbox and rear axle from a riding lawn mower. I mounted the axle with the tires on it, and got a lightweight trailer axle for the "idler" axle and let the drum rest on the tires. I used an electric motor to run the lawnmower axle and could control the rpm's by shifting gears on the axle. You can also change out the pulleys on the axle and motor to fine tune the rpm's.

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Re: Large parts tumbler in the works

Postby Black Forest » Sat Aug 20, 2016 3:32 pm

I use a cement mixer with sand, stones and dishwashing soap.

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Re: Large parts tumbler in the works

Postby comeoutswingin » Sat Aug 20, 2016 4:14 pm

All my parts showed up today. I am making some final changes to the design and laying out the motor mounting holes in CAD. As far as octagon shaped, I'm sure it works well, but I do currently use a cement mixer for my small parts and it works awesome. It has fins inside that stir the parts and I know I can accomplish the same thing with the round barrel. I'm looking to tumbler parts larger than I can fit in the cement mixer, that's the reasoning for this build. I am getting really tired of wire wheeling parts with the rate I am cutting lately.
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Re: Large parts tumbler in the works

Postby DesertFabworks » Sat Aug 20, 2016 10:52 pm

Building your own custom one is cool but its hard to beat a $50 cement mixer off craigslist. I have been using this method for quite awhile and it works very good. I got one with a plastic tub and its very quiet and when I finish I dump the tube threw a bucket with a sifter on it and I'm done.
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Re: Large parts tumbler in the works

Postby comeoutswingin » Sun Aug 21, 2016 3:14 am

DesertFabworks wrote:Building your own custom one is cool but its hard to beat a $50 cement mixer off craigslist. I have been using this method for quite awhile and it works very good. I got one with a plastic tub and its very quiet and when I finish I dump the tube threw a bucket with a sifter on it and I'm done.


Sure, exactly! My HF cement mixer works AWESOME! for small parts. The entire reason for this build is to be able to tumble BIG parts. I am looking to tumble batches of 12x24ish parts. I can't exactly fit too many of them in my HF mixer unless I'm missing something?
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Re: Large parts tumbler in the works

Postby yroc fab » Sun Aug 21, 2016 10:56 pm

Excited to see how yours turns out. I will be building one here shortly.

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Re: Large parts tumbler in the works

Postby comeoutswingin » Mon Aug 22, 2016 12:55 am

Tumbler.JPG


Powered it up tonight, RPM looks to be perfect. I have to finish the wiring and finish the door tomorrow. Hopefully I will be able to actually test it out.
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Re: Large parts tumbler in the works

Postby Capstone » Mon Aug 22, 2016 8:17 am

nice! looks just like the CAD drawings. Are you willing to share them?
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Re: Large parts tumbler in the works

Postby comeoutswingin » Wed Aug 24, 2016 2:00 pm

So, I used it. Couple things, I filled it with about 400 lbs of pea gravel to cushion the parts because it tumbled a little too well. I'm going to hinge the door some how, not sure yet.

I also have another sprocket on order to build a chain tensioner. I got a ton of stack tolerances on the large sprocket I cut, but I was able to file it out.. It just took a bit.

I'll probably post these plans after I make the changes to everything.

Here's a video of motion, I am pleasantly surprised as to how well it tracks.
https://www.youtube.com/watch?v=MDhFItKVQyU
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Re: Large parts tumbler in the works

Postby Capstone » Wed Aug 24, 2016 2:17 pm

super cool. thanks for sharing.
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Re: Large parts tumbler in the works

Postby tnbndr » Thu Aug 25, 2016 5:59 am

Nice, turns faster than I would have expected!
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Re: Large parts tumbler in the works

Postby acourtjester » Thu Aug 25, 2016 7:59 pm

Hey comeoutswinging what program did you use the plan the cut for the large sprocket. I know Inkscape has a gear plan for cutting spur gears.
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Re: Large parts tumbler in the works

Postby comeoutswingin » Fri Aug 26, 2016 2:55 am

I used sprocketeer to draw the large sprocket
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Re: Large parts tumbler in the works

Postby acourtjester » Fri Aug 26, 2016 9:46 am

Thanks for the reply I looked on Google after posting the question and found that program.
Good to have the feed back it worked for you..

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Re: Large parts tumbler in the works

Postby MIFab » Tue Nov 01, 2016 12:25 am

So how is this working out ?

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Re: Large parts tumbler in the works

Postby comeoutswingin » Tue Nov 01, 2016 12:19 pm

It works good for my small parts. It will tumble my large parts no problem, but I have to figure out a media to use to cushion the really big parts from beating the crap out of each other. I tried pea gravel, but it was too muddy even from the bag.. so I washed it all.. Still too muddy, I didn't really gain anything by tumbling when I had to wash the parts off...

As of now I have been filling it with drops from my table for media.
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Re: Large parts tumbler in the works

Postby abmetal » Tue Nov 01, 2016 10:20 pm

I've been using granite chat in our vibratory tumbler. It's hard and works good. We have a granite quarry fairly close though.

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Re: Large parts tumbler in the works

Postby sr guy » Fri Nov 04, 2016 2:32 pm

Awesome build!!
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Re: Large parts tumbler in the works

Postby Frog Island » Thu Nov 10, 2016 11:03 pm

Very nice. You might look at garnet sandblasting media. Or the larger slag media.

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Re: Large parts tumbler in the works

Postby nalin400m » Thu Dec 15, 2016 10:36 am

Looks great, will be following!
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Re: Large parts tumbler in the works

Postby jwallmuth » Fri Feb 03, 2017 8:05 am

did you ever post the file to this project?

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Re: Large parts tumbler in the works

Postby comeoutswingin » Tue Feb 07, 2017 4:51 pm

I did not post the files.. I'll try and get a .zip file made up and post what I can remember..
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