What Is The Biggest Diameter Of Steel You May Cut?

Bingo, royesses, that what I wanted to know. So, I may stay with mini lathe. Just improve it a little bit. I have 30206 bearings, and if I remember correctly, they altogether wider something like 1.5 mm then original. Problem is, I do not know dimension of the spacer until I remove original bearings and get access to the spacer. Besides, I was told to replace the spacer with a metal one. But not sure which one was mentioned, that one, or other, which sits close to double nut on left side.

Edit: spacer in question is white one on picture 6 in http://www.arceurotrade.co.uk/machineguides/Mini-Lathe-Angular-Contact-Bearing-Change-Guide.pdf
But make a metallic one I think was on pic 3, black one. Same URL

I don't know if you can order from littlemachineshop.com will they ship to you?, but you could order the oem spacer from them and make it out of any material you'd like. Also you could take it apart first and measure what is in yours. Your bearings are each 1.25mm thicker than the original bearings. So you would need to cut the spacer 2.5mm. I've had mine apart numerous times and don't even need to remove the headstock from the lathe to replace the bearings. I do use a blind bearing puller to remove the bearing from the housing. LMS may actually give you the dimensions over the phone. Worth a try. I may put the 30206 bearings in mine if the angulars don't pan out. So far so good though. Also the reduction pulley kit claims a 65% increase in torque. I have uploaded the arc-euro roller bearing upgrade instructions in pdf. Don't know if they will help you or not.
Roy

If you have a c2 7x12 just the rear spacer needs .010 or 2.5 mm cut off the length according to LMS. From LMS:
This spacer goes on the spindle shaft behind the rear bearing.
This plastic spacer is 40 mm OD, 28 mm ID, and 32 mm long.

This is a tapered roller bearing that can be used to replace the spindle bearings on the mini lathe. It requires two of these bearings to update a mini lathe spindle.
These bearings are slightly wider than the standard bearings so the rear spacer must be shortened about 0.10" to use them.
 

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Oh, speaking of largest diameter turned, My 6 x 24 has handled 4.5 in cast iron, I turned the backing plate down to match my 4" 3 jaw chuck. Could have handled larger, I guess.
 
I don't know if you can order from littlemachineshop.com will they ship to you?, but you could order the oem spacer from them and make it out of any material you'd like. ...

Yes, great idea, thank you
 
Now, idea is to make a stop inside the spindle, so I may insert piece of metal in chuck up to certain depth and make many pieces pre cut
to the same length. We used to have it on old german lathe. It was a threaded bar which we screw in the spindle.
So, to do that I need to make a piece with internal thread M27x1.5 and set it on spindle right behind double nut.
That piece would also have let say 1/4-20 thread for a bar to screw in.

Now, to make internal M27x1.5 thread I would have no problems on mini lathe or that is a good excuse to buy G9972Z on sale and prepare for hard talks with wife? ;)
 
Now, idea is to make a stop inside the spindle, so I may insert piece of metal in chuck up to certain depth and make many pieces pre cut
to the same length. We used to have it on old german lathe. It was a threaded bar which we screw in the spindle.
So, to do that I need to make a piece with internal thread M27x1.5 and set it on spindle right behind double nut.
That piece would also have let say 1/4-20 thread for a bar to screw in.

Now, to make internal M27x1.5 thread I would have no problems on mini lathe or that is a good excuse to buy G9972Z on sale and prepare for hard talks with wife? ;)
I have made work stops for the head stocks on my Atlas 6" and my Grizzly 10 x 22. Here is the link for the one that I made for my G0602: http://www.hobby-machinist.com/threads/lathe-headstock-work-stop-g0602.32809/

I found a suitable tap on eBay for about $15 and cut the external threads for the adapter on the lathe.

For a bore your size, I would use a larger diameter stop rod. I used 3/8-16 rod. 1/4-20 is rather spindly.
You will find a number of other designs on the website as well.
 
for testing I have turned 8620 3" dia in my 7x16 either with the tail stock support or not I only can do about 20thou per pass ....and the lathe is more then powerful enough plus i use either my 6 3/8" dia chuck or the 4 jaw...but the 4 jaw is way out of balance :(

anyways...my hendey lathe which i just sold is a flat belt conehead and can turn about 50thou per pass so not too bad for the little lathe
 
On my BV20L-1 I have turned steel on 6 inches. No problem at 140 rpm (the minimum it has)
I can remove 1mm on diameter easily.
 
Not to brag, I've faced off a piece of 12" OD aluminum plate on my 20" Lodge & Shipley lathe taking a 1/4" depth of cut at about .015" feed rate. The was around 500 RPM. The 10 HP motor didn't even groan.
 
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