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Stuart No. 4 Build

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grayone:
From post #3
I then glued the two together, planning to turn the bosses. However, I realized that I had no true surface I could use to ensure that the join was aligned the turning axis, and in the center. So after some application of heat to undo the Superglue, I used a chuck spider in the 4-jaw to put a small flat on top of each bearing, with the bearings having the same thickness:

What is a "chuck spider" and what is it used for and why -  :scratch: - sorry if this is a dumb question but never heard this term before

Graham

PekkaNF:

--- Quote from: grayone on July 21, 2012, 07:36:04 AM ---From post #3
I then glued the two together, planning to turn the bosses. However, I realized that I had no true surface I could use to ensure that the join was aligned the turning axis, and in the center. So after some application of heat to undo the Superglue, I used a chuck spider in the 4-jaw to put a small flat on top of each bearing, with the bearings having the same thickness:

What is a "chuck spider" and what is it used for and why -  :scratch: - sorry if this is a dumb question but never heard this term before

Graham

--- End quote ---

Seemed to be that cheese plate between chuck face and part. Like this:
http://www.cnccookbook.com/img/OthersProjects/CNCBusiness/LatheSpiderDrawing.jpg
Most likely used a back stop to stop part on right place to make multiple parts of same length. Bit like a back stop.

Then sometimes it is sort of "spreader" to preload jaws for truing the jaws - takes up slack to same direction as when in use.

And then again I have heard it used at the back of the spindle to center longish piece from back end:
http://img.photobucket.com/albums/v654/300sniper/rifle%20tools/barrelthread2.jpg

And same thing at the nose of spindle is sometimes called a "pot chuck".

After this explanation I have confused even myself :D

Pekka

smfr:
Here's a page that explains this style of chuck spider:

http://www.neme-s.org/Spider.htm

Simon

mackye:
hi simon,

hows the engine progressing??

i followed this thead over from HMEM as its such a beautiful build!!!

mackye

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