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#1

SneakyCuttlefish
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Joined: 24 June 2014
Posts: 232
Member
25 March 2018 02:20 pm

I started building some gear a while ago. Nearly got the trommel done. The aim is to have the trommel wash run through a jig (still yet to be built) and the whole thing will be mounted on a trailer.

Only cost me around $400 so far for someone to role up the cylinder, make the octogon frames and buy bearings for the rollers. Materials are from whats just laying around at home from other projects.

Frame: Octagon shape adds strength and serves a s a great spot to mount some sheilding and the rollers.
1521947872_20180325_083438_640x480.jpg

4 users like this post: Mackka, RM Outback, Heatho, The Green Wanderer

#2

SneakyCuttlefish
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Joined: 24 June 2014
Posts: 232
Member
25 March 2018 02:24 pm

Cylinder is 400mm by 1800mm? (can't remeber the exact length). Rolled steel with a some metal collars that serve as plates for the rollers. Haven't got the mesh in place yet. 4 angle peices serve as agitators.

1521948085_20180325_083503_480x640_640x480.jpg
1521948284_20180325_083509_640x480.jpg

Last edited by SneakyCuttlefish (25 March 2018 02:25 pm)

3 users like this post: Mackka, RM Outback, Heatho

#3

SneakyCuttlefish
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Joined: 24 June 2014
Posts: 232
Member
25 March 2018 02:30 pm

Rollers are the tricky part. I have a tendancy to massivly over engineer things. But the idea is to build something that lasts forever and can be maintained as well. The last thing I want it to have to drive 18 hours round trip to replace a broken part. The rollers have twin bearings and can be easily disassembled for maintenance.

1521948344_20180325_083517_640x480.jpg

2 bearings
1521948563_20180325_083544_480x640.jpg

Dissasembled with just 2 bolts and 2 grub screws
1521948613_20180325_083536_480x640.jpg

3 users like this post: Mackka, RM Outback, Heatho

#4

SneakyCuttlefish
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Joined: 24 June 2014
Posts: 232
Member
25 March 2018 02:38 pm

A common problem is drum creep. Especially when the machine tilt is adjusted. Simple physics. The first idea was to make the collars a channel but the problem with this is it puts side loading on the bearings and will wear heavily on the up side edge of the roller. Easiest way to fix this is to add a fifth roller and a lip on the end of the drum.

Barrel creep after just a few turns. Tilts is 20 degrees
1521948663_20180325_110315_640x480.jpg

Lip in place
1521948974_20180325_115130_640x480.jpg

Roughly were the fifth roller will be. Still need to build a section of the frame to hold it in place.
1521948996_20180325_115157_640x480.jpg

9 users like this post: Mackka, Dolphin, RM Outback, Rockhunter62, aussiefarmer, Ship of fools, Crow Pickens, The Green Wanderer, Beagleboy

#5

Mackka
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From: Brisbane
Joined: 18 February 2014
Posts: 2,267
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25 March 2018 02:58 pm

Looking great Sneaky.
Mackka thumbsup

#6

Dihusky
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From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 133
Member
25 March 2018 07:38 pm

Now that's a seriously good looking piece of kit! Certainly take some punishment, what screen size are you planning on?

#7

SneakyCuttlefish
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Joined: 24 June 2014
Posts: 232
Member
26 March 2018 11:41 am

Haven't worked that out yet. Depends on how big I make the jig I guess. Also I'm planning to make several screens for it so I can swap em out depending on the ground.

#8

Dihusky
Member
From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 133
Member
26 March 2018 03:10 pm

That'd make sense, recon you might need a jib on the back of the ute to move it, not looking to be a featherweight!!

#9

SneakyCuttlefish
Member
Joined: 24 June 2014
Posts: 232
Member
27 March 2018 09:27 am

Yeah its definitely got a bit of weight to it. It's easy enough to move piece by piece but that's a bit of a pain. I'm aiming to build a small off road trailer to mount the gear on permanently. Kind of like a mobile mining rig.

#10

LoneWolf
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From: Gold Coast , QLD
Joined: 12 April 2016
Posts: 1,276
Member
27 March 2018 12:42 pm

Nice.. thumbsup .. What are you going to power it with?

LW....

#11

SneakyCuttlefish
Member
Joined: 24 June 2014
Posts: 232
Member
27 March 2018 05:03 pm

Haven't decided yet. I'm leaning towards an electric motor and a geny. The geny can be used for the campsite at night.

Also more grunt for less weight as the motor will have to run the jig and trommel together. If I install a soft start i think i should be able to get away with a standard .75kw motor. Lucky i have a few lying around to try with.

At this point i am looking at a twin belt around the cylinder but if i can find a way to run a chain that would be better.

Decisions, decisions!

#12

rusty69
Member
Joined: 14 April 2018
Posts: 11
Member
14 April 2018 11:12 am

geez there are some fine engineers on here

put me to shame.

My old man could turn his hand to anything wishing now I had inherited theright jeans cry

#13

Dihusky
Member
From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 133
Member
14 April 2018 05:25 pm

SneakyCuttlefish wrote:

Haven't decided yet. I'm leaning towards an electric motor and a geny. The geny can be used for the campsite at night.

Also more grunt for less weight as the motor will have to run the jig and trommel together. If I install a soft start i think i should be able to get away with a standard .75kw motor. Lucky i have a few lying around to try with.

At this point i am looking at a twin belt around the cylinder but if i can find a way to run a chain that would be better.

Decisions, decisions!

I think V belts will probably work better, if you install a couple of guides on the drum they won't try to jump over each other, you can use a roller tensioner and dust won't worry the belts too much. Chain on the other hand you are dealing with lubrication, dust ingress into the chain, sprockets etc and zero slip, so if anything jambs up there is no give until it breaks or the motor burns out unless you have overload protection. The third alternative would be a flat drive belt, something like the ones F & D O'Connor supply, simple and reliable dust won't pose a problem and will slip for protection. Probably my preference.


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