Impact Mill , Chain Type .

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This is what I am building at the moment . I am making it in units so that it can be dismantled and packed in the truck . I do not want to weld it all together and then have to use a trailer . It will be petrol engine driven with a belt . Also thinking of having the option to fit a 240 volt electric motor . As you can see , I am mounting it on springs . Chains get out of balance and cause a lot of vibration . The exit is on the bottom of the drum . It is small round bars that are spaced at 2 m.m. This is removable and I hope that there is less chance of it getting blocked up . I have a small flywheel that I am going to fit on the shaft . This is to smooth out some of the vibrations .
 
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This is the discharge grill , the bars are silver steel and spaced at 2 m.m . It fits in the drum so the bars are level with the bottom . I did arc weld the bars in but that might not be a good idea , they might crack and break off at the ends . We will see . I used silver steel because it is hard and will not mark as against mild steel or stainless steel , when it is hit by flying rocks.

The bars are in line with the rotation of the chains , I will put up more photos as work progresses .
 
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Showing how the discharge grill will fit in the bottom of the drum . I have put it in the bottom as I want the material to dis charge as quickly as possible . If it does not work out , I will move it up the side .
 
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Went and bought some 8 m.m. chain to day . Was advised by the expert to use R70 and not R80 . R80 is used for lifting chains and has a little bit of give . R70 is used for tie down chains .
 
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Shaft is 1 inch dia , needs to have keyway cut before welding flat bars on . Also needs to be cut to length .

I have drilled the holes "neat " that is 10 - 10.1 m.m. dia. for 10 m.m. bolts . The idea behind that is they will be less likely to come loose . I am planning to use some Locktite on the bolts but not the real strong stuff.

Flat bar is 10 x32 m.m. 300 m.m. long , mild steel .
 
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With a straight feed tube , you have to be care full that the rocks do not fly back . That is MIG welded , I only have a stick welder . My welding is not so good as it was , but I am happy that I can still do a bit of welding at 75 . Keeps me out of mischief !
 
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End plates for my mill . I have put 3 m.m. insertion rubber on with contact adhesive . This will seal the ends and maybe reduce the noise ... Been welding the flat bars to the round shaft to day .

The steel plates are to stop the rubber pealing off .
 

Muk

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No I have never had rocks come back up the straight tube and also have added a lid the rubber on your end plates is a good idea all the best with your crusher cheers Muk.
 
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Not much work done on the impact mill lately . All the construction work is more or less done . Engine needs setting up , pulley is a bit too tight on the shaft . Drum needs to be bolted to the frame and shaft fitted . Will put photos up when it is finished and running .

Bought this Nox 800 which has been taking up my time . The beaches in Sydney have been washed away . Raining at the moment but hope to get out to morrow . The Nox 800 is a good machine , I am very happy with it .
 
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Nice design Mike. I have a few different crushers on the go at the moment. Chains are OK but I got tired of hard facing and building them up.,, So,, I got hold of some 20mm thick Bisaloy 600 and made up a rotating assembly out of that. My mill is side discharge so the screen will last along time. I hope yours works out well. What are the drum dimensions. Maybe look into buying a taperloc pulley to suit your motor shaft, as this will be easier and to adjust for alignment and have a stronger clamp on the shaft and Key.
 
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By the way Mike, If youre still able to see a weld pool through a welders lens at 75yrs old then well done to you . I really struggle now at 55yrsold.
 

Nightjar

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Mike678 said:
Not much work done on the impact mill lately . All the construction work is more or less done . Engine needs setting up , pulley is a bit too tight on the shaft . Drum needs to be bolted to the frame and shaft fitted . Will put photos up when it is finished and running .

Mike, looking forward to seeing your running photos.
My next project, for starters, have the motor. :playful:
 

Nightjar

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jethro said:
By the way Mike, If youre still able to see a weld pool through a welders lens at 75yrs old then well done to you . I really struggle now at 55yrsold.

Jethro, You need to pay a visit to "SpecSavers", no problems here (74yo) like Mike running a bead. ;)
 
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Same here.....
Me Im only a young pup....
67 lol.....
Can still run a bead or two......
No Magnifying Lenses Required.....
The old Sparklers / Fizzle Sticks P5s were many years ago lol:....
 
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Thought I would put up another photo or two . Not much work been done on it in the last few months .

The handle and wheels will only be used to move from one spot to another . The legs slot and bolt onto the main frame , might need some cross bracing but I want to keep it clear under the drum to get plastic buckets in .

I have put a small flywheel on , it was sitting under the bench doing nothing .
 
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these impact chain mills look good, a bit different to the ones I built using a 5" angle grinder to drive the mill.

I have stainless Steel chain fitted to the 25mm shaft to do the smashing and for the outlet sieve I drilled 1/8" holes in a 45mm x 70mm rectangle on about a 5mm grid pattern in the 210mm dia pipe drum

The 25mm shaft has a 14mm internal thread so it screws to the angle grinder shaft

cheers dave
 
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My understanding is that 'Riggers' chain is harder an less wearing also, other chains can stretch and break by fatigue and impact.

Most chain is mild in hardness, but I sense that you guys will already know this and have your reasons for selection.

Pointing it out for the beginners around.

Cheers. :)
 

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