Scott flame licker build

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kvom:
This is moving right along. I hadn't read the thread for a week or so, and enjoyed the past 4-5 pages a lot.

For those who have them (or can get them), the Jacobs rubberflex collets and chuck are also useful for holding thin-walled tubes in the lathe.

I noticed you mentioned using the centering device in the lathe. I recently bought one and am wondering what the technique you use in the lathe. I assume that the tailstock needs a rotating chuck or the like for centering a bore in a 4-jaw (or am I missing something obvious?)

NickG:
Still watching, have enjoyed this and a few other projects whilst on my break from the workshop - great work, pics and write up.

Nick

Bogstandard:
Arnold, I'm glad you can still glean a few tips from my ramblings. It is simple ones like that which can overcome major problems. The other way around the problem I had would have been to make a dedicated holding mandrel to get clearance for the cutter. Three little washers was the easiest route, so why not take it?

Some people could easily get carried away when faced with a problem like that. I know, I have done it.

Actually Rob, the reason I put a winding handle on the stepper was for occasions such as this. I didn't require the DivisionMaster this time, as it only needed to be turned a couple of degrees, all other movements were done with the mill itself.

Kvom,

If you mount the coax indicator in an accurate running chuck, and have it touching on a full solid centre held in the tailstock, the tailstock (as long as it doesn't have a droop snoot) can be realigned perfectly side to side.

If you mount it into a normal chuck in the tailstock, and indicating on a part in the rotating lathe chuck, it will work exactly the same as having the coax spinning. So you can use the centre finder tip into a punch mark, or inside or outside indication just by rotating the four jaw. It works in exactly the same way as a normal DTI being held on a magnetic stand.

Still getting there Nick.

John

lordedmond:

--- Quote from: bogstandard on March 01, 2011, 06:31:46 PM ---Arnold, I'm glad you can still glean a few tips from my ramblings. It is simple ones like that which can overcome major problems. The other way around the problem I had would have been to make a dedicated holding mandrel to get clearance for the cutter. Three little washers was the easiest route, so why not take it?

Some people could easily get carried away when faced with a problem like that. I know, I have done it.

Actually Rob, the reason I put a winding handle on the stepper was for occasions such as this. I didn't require the DivisionMaster this time, as it only needed to be turned a couple of degrees, all other movements were done with the mill itself.

Kvom,

If you mount the coax indicator in an accurate running chuck, and have it touching on a full solid centre held in the tailstock, the tailstock (as long as it doesn't have a droop snoot) can be realigned perfectly side to side.

If you mount it into a normal chuck in the tailstock, and indicating on a part in the rotating lathe chuck, it will work exactly the same as having the coax spinning. So you can use the centre finder tip into a punch mark, or inside or outside indication just by rotating the four jaw. It works in exactly the same way as a normal DTI being held on a magnetic stand.

Still getting there Nick.

John

--- End quote ---

John

Having just got a coaxial indicator myself ( Amadeal do them for £48 inc vat ) , I am confused with your comment on using it in a normal tailstock chuck indicating on the part in the main chuck , my indicator only moves in one plane ( no problem if that is rotating ) but would your method not put side strain on the device. I can see how it could be used with a rotting tailstock chuck and the work stationary as it is in a mill

or am I missing something as usual :doh:

Stuart

Bogstandard:
Stuart,

I don't see how it could put side strain on, purely because as the probe is moved, the way the coax unit is built, it turns that sideways movement of the probe into the linear movement of the coax body moving up and down it's shaft. Hold the coax by it's main spindle and press on the probe to see what I mean.

So it makes no difference whether the part is rotating and giving an offset reading or the part stationary coax spindle rotating.

But of course, if you are using the coax stationary, you have to do all you adjusting in line with an imaginary line from the probe tip to the centre of the coax unit.

John

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