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If your 3 jaw is good and not worn or abused the use of a 4 jaw is in my view unnecessary on round bar. if you are turning several diameters on one end and not taking it out of the chuck then the finished work will be bang on concentric, if not you have a serious problem with your tooling. Even...

Friction welding used in manufacturing does not normally use a lathe as we know it, it is a very specialized piece of kit, it may look like a lathe but that is where any similarity ends. To weld it has to get the parent metal to melting point, lots of sparks etc and given enough time to fuse...

Start by using the rings on the face of the chuck you should easily get to within .05mm, then use a clock to measure the total throw, move the work over by half the throw, do one pair of jaws first then the other gradually coming to center. When very close just crack the jaw lose and squeeze...

Sorry I did not intend it as critisism just an aside.

I find the Arkansas stones a bit soft but there again everybody has their favorite.

The oil stones are called "India" stones and come in a variety of sizes all about 4"/100mm long x 1/2"/12mm in section, and are readily available in variouse grades.

What you are describing is almost a burnished finish except you are taking a cut, put very simply the tool is blunt and pressed against the surface and lubricated to achieve a mirror finish generally used for bearing surfaces as it also makes the surface more dense but not much use for making...

Hi Me again I agree with Brian Rupnow about a heavy first cut, this is common practice in manufacturing mill scale is very abrasive but also the actual skin of the bar can be exceptionally hard to the point that it can't be turned or milled you must get under the skin. I've even taken an angle...

Hi When you take a facing cut the surface speed is constantly reducing as you travel to the middle, so for us compromises have to be made, I generally don't use power feed when facing I prefer to "feel" the cut. C.N.C. machines used in high end production are often able to alter the speeds and...

To enlarge upon Brian Lawsons comment I use the open jaws of a vernier at flat to the skin using the same method to locate the splinter then close the jaws on the little blighter and pull, try it it works and for the us with less than 20/20 eyesight the jaws allow a large margin of error to grip...

The one way bearing referred to by XD351 is called a spragg clutch, and I believe that is the correct spelling.

Just remembered I started working for Marconi space and defense in 1976 and they used a metric clock (100mins to the hour) now that was confusing the only people who liked it were the people pricing jobs as the amount paid was the cost of the contract plus the negotiated profit, those were the days.

In 1969 I was an apprentice with the Lucas Group with several large sites in the UK, our wonderful government of the time decreed in their wisdom that we shall be metricated and so all our machines were converted new lead-screws, dials etc. unfortunately our drawings and instruments were not...

Yes you rub against a reference surface therefore removing blue from high spots, no matter what your prefered method you are never going to get a uniform overall colour just lots of "rubbed" of spots the more spots the better as previously mentioned by me and one other contributor. With the...

Hi again I was always taught to "blue" the work piece and then pressure does not enter the equation also you are not trying to push blue into low spots to get contrast, however as said earlier each to their own as long as the desired result is achieved.

Another method to form a coil is to crimp and solder one end fill with cold water which is not compressible, then fold and tightly crimp the other this has been used up to 15mm Dia tube when making a still this is obviously done cold. There have been a lot of comment regarding annealing copper...

Forgot to say drill and ream gudgeon pin hole (UK speak for wrist pin' don't know the origin) then fit pin to hole.

Ditto josodl1953 post except common practice in model engines is a PTFE button very low friction etc. and thermally stable, just a bit of a pig to machine and can have health issues just google for sensible precautions.

The Stuart blue (Chronos sell it in the UK it lasts forever) I have found to be very good it needs to be the consistency of petroleum jelly (Vaseline) as to method of application you can't beat a finger your going to get in on you anyway, apply as you would a very thin smear of ointment to the...

If using high spot to get something flat as opposed to matched the surface you are checking should be rubbed on 2 known flat surfaces as only using one can lead to errors if the master has an error, this is how surface plates are scraped. Machine ways etc of high quality would be scraped and...