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Disassembling of Minimill / X2-clone / XJ-12 Ballbearings

Stripping down Chinamill

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Peter G. Shaw05/07/2010 13:20:11
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1531 forum posts
44 photos
Hi Marcus,
Firstly, sorry about the words I used. I was probably trying to be very precise in what I was saying assuming  good  English.
 
Second, your drawing is the same as mine, and therefore wrong as my machine is not quite the same. I will now go and take some photos etc.
 
I'll report back later.
 
Regards,
 
Peter
 
ps. I sent you an email via "My messages". Did you get it?
 
Peter G. Shaw05/07/2010 13:55:35
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1531 forum posts
44 photos
Three photos which I hope will make it easier to understand what I did.
 
Here goes.....



 
Does this help? If not ask again.
 
In the top photo, I used a piece of shim steel about 15mm wide and the full depth of the black block. It has one hole through which the top screw fits. The shim then just hangs there until clamped by both screws. Th idea is to twist the block round vertically so that the horizontal shaft moves away from the milling head itself.
 
In the second photo, the two washers are placed between the cover plate and the block and over the screws. It can be fiddly as they are small, and drop off easily.  The idea is to lift the cover plate away from the block thus allowing the worm inside freedom to rotate.
 
In the bottom photo, the idea is to move the block around  until the shaft can rotate without binding, and the knob can rotate without binding against the block. It could even be that turning the black block round through 180 degrees sideways could help. It all depends on the location of the various holes. Mine are very poorly drilled, and I have plans to replace it sometime.
 
Regards,
 
Peter G. Shaw
 

Edited By Peter G. Shaw on 05/07/2010 14:04:31

MarcuSweden05/07/2010 21:22:42
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29 forum posts
20 photos
Thankyou wery much ! This did help ! Now i understand what to do and also why.
 I´m now ready with my conversion from  gearwheel to belt, I will post some photos as soon as im done with some cleaning around the machines.
Today i tried the minimill for the first time, and it was actually better than i thought, milled some steel with a 12mm endmill and also some aluminium with a 16mm endmill, it was really fun !
 
 
I have also bought one low price tachometer that i used today for checking the spindlespeed, i bought it from :
 
 http://www.dealextreme.com/details.dx/sku.18239
 
The price of the tachometer is very low and the quality is more than good enough for measuring millingmachines and lathe, free shipping also. The parcel came after 2 weeks and it works wery well.
 
Right now i found the mail in "My Messages" , I will start looking at the messages more frequently! I will answer with message !
 

Clive Farrar06/08/2010 22:57:27
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125 forum posts
41 photos
Well chaps my belt drive conversion is now finished.
 
To suit my machine I had to make several small dimensional modifications to the drawings I was working from.  Mainly because my motor is totally different to that drawn.
 
Once I had sorted out the excessive bearing pre load that meant top speed was about 60 rpm it is running great.
 
It is much quieter than the gear drive.
 
Hi low top speeds have gone from 1100 to 1700 , 2500 to 3200 a good range and a good increase. Although for me I susspect it will rarely be out of low gear.
 
Very very pleased with the result and I would recommend the job to anyone who smashes their gears.
 
regards Clive
Ian S C07/08/2010 02:17:37
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7468 forum posts
230 photos
Hi Clive, what is the minimum speed the mill will run at? I find that the important speed, perhaps I try to do jobs that are too big, my mill is a bigger one, with a minimum speed of 90 rpm, I would like it to be 60rpm or less.Ian S C
Clive Farrar07/08/2010 20:50:38
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125 forum posts
41 photos
Ian I can not say for sure as the only rev counter i have is for model aircraft and works in steps of 100.
 
It flickers on 1 but the tippex marks are going round too quick to count so I think it is fairly close to 100. It does not take much of an increase on the speed pot for it to steady at 1.
 
I have not tried cutting anything at that speed but I suspect it will only do very fine cuts when going that slow.
 
Mind you the pullys were easy enough to turn up so a slightly bigger one, 90 mm ?, would probably get you down to the speed you need.
 
Regards Clive
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