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#1

AussieMate
Member
From: Darwin, NT
Joined: 06 August 2019
Posts: 10
Member
25 October 2020 05:59 pm

Hi guys.

I'm in the process of building a chain mill (tight budget) to fine crush quartz rock for gold. The drum will be hexagon shaped, 150mm wide and an inside diameter of 320mm. It will be driven by a 4stroke 6.5hp petrol motor with pulleys and belt. The chains inside will have hard-faced paddles on the ends.

My question is, what would be a good rpm to aim for?

Cheers


The quality is remembered long after the price is forgotten.

#2

Eski
Member
From: G'BOROUGH, VIC
Joined: 10 May 2015
Posts: 292
Member
04 November 2020 09:53 pm

i think you need to target around 3.5k , a lot of these engines don't have throttle controll and simply use a governor to controll butterfly based on load... IE pressure washers and generators...

#3

Mike678
Member
Joined: 21 October 2019
Posts: 345
Member
05 November 2020 10:11 am

If you look at the power curve for small stationary engines , you will see that the greater power out put is when it is going faster . But it is using more fuel ! You will get more power out put at 3,000 r.p.m than 1,500 r.p.m. If it is governor controlled , you can make it adjustable with a bit of fencing wire ....


Opal from my lease .

#4

Goldtalk Leonora
Member
Joined: 15 July 2015
Posts: 130
Member
05 November 2020 10:58 am

I made one with a single cyl diesel....I just control the rpm's with the throttle. What I find is the size of material feed and quantity
and most importantly moisture content is what bogs down the crusher. I always run the thing near flat out and it works fine!

#5

Mike678
Member
Joined: 21 October 2019
Posts: 345
Member
20 November 2020 10:50 am

If you are using a 6.5 h.p. engine , I suggest you use twin vee belts .


Opal from my lease .

#6

Mike678
Member
Joined: 21 October 2019
Posts: 345
Member
23 November 2020 02:09 pm

Just seen a new 6.5 petrol engine for sale , $159 . I am tempted to buy one , 1 year warranty .

www.edisons.com.au For anybody that is interested .


Opal from my lease .


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