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#Post#: 66716--------------------------------------------------
Methods
By: Al Smith Date: December 21, 2015, 5:15 am
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Everybody has a method of machining cylinders and pistons and
they all work .This is mine.
First on the piston I just chuck it in a long jawed 3 jaw with
softeners .Shown is a 200T getting a pop up of maybe 10-15 thou
.Budweiser can for softeners but I suppose Pepsi would work just
as well.It holds pretty square believe it or not .Ya gosta
remember it's a pert for a chainsaw not part of the space
shuttle
#Post#: 66717--------------------------------------------------
Re: Methods
By: Al Smith Date: December 21, 2015, 5:26 am
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Next the cylinder.I stumbled on to this one night whilesipping
on several brews reflecting my thoughts for the day.What if I
said to myself,why not try --so I did .
I've got a Hardinge -Jorgenson 5C collette chuck that runs dead
on .Using a piece of cold roll and screw on nylon arbors it cuts
dead nuts .I make the arbors just short enough that the chamfer
can be cut in the same operation .The arbors of which I have
several are tight enough in the bore you have to tamp the
cylinders on .
Shown is a 200T cylinder .It dawned on be I had no way to
measure because it was so tiny so I used a snap gauge and a set
of 2-3 mics .Half azzed but it worked
#Post#: 66718--------------------------------------------------
Re: Methods
By: Al Smith Date: December 21, 2015, 5:29 am
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The one pic shows the wedges you use to remove a tapered drill
chuck .They also work to remove a stubborn bearing from a Stihl
chainsaw ;)
#Post#: 66741--------------------------------------------------
Re: Methods
By: Cut4fun Date: December 21, 2015, 1:21 pm
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Is that the lathe needing fixed now?
#Post#: 66753--------------------------------------------------
Re: Methods
By: Al Smith Date: December 21, 2015, 7:49 pm
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Yes, the electrons went funky and I got tired of fooling with
it. I have a new solid state controller but working 7-12's
haven't had time to install it .That ole gal is a good one when
it runs .I think I could put threads on a darning needle .
#Post#: 67050--------------------------------------------------
Re: Methods
By: awol Date: December 24, 2015, 7:35 pm
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The collet chuck makes it real handy, but I may use the screw
on mandrel idea with my standard three jaw. I've been using one
piece plastic mandrels, but they have a lot of deflection, even
when supported with the live center.
#Post#: 67119--------------------------------------------------
Re: Methods
By: Gatekeeper Date: December 25, 2015, 8:41 pm
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[quote author=awol link=topic=5496.msg67050#msg67050
date=1451007345]
The collet chuck makes it real handy, but I may use the screw
on mandrel idea with my standard three jaw. I've been using one
piece plastic mandrels, but they have a lot of deflection, even
when supported with the live center.
[/quote]
What kind of plastic are you using?
#Post#: 67160--------------------------------------------------
Re: Methods
By: awol Date: December 26, 2015, 10:51 am
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I don't know for sure what it is, I just picked up a couple
long sticks at the scrap yard. It machines really nice, and
works well enough for base cuts. I noticed when I run the live
center up against the jug, if I apply to much pressure the
runnout increases near the center, even though both ends are
good.
#Post#: 67166--------------------------------------------------
Re: Methods
By: Gatekeeper Date: December 26, 2015, 11:03 am
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Some of what I had I was putting too much pressure on as well.
Half the time I use ash rods for bases and sanding mandrels.
Make them tight as will slide on there. I'm not getting any
deflection that I can notice when cutting the base. I need to
get a little more aluminum or Type 2 PVC. Hard to beat for
rigidity on there.
#Post#: 67593--------------------------------------------------
Re: Methods
By: weimedog Date: January 2, 2016, 11:08 am
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Very nice and obviously effect set of concepts. I found round
nylon and Teflon blanks on ebay for arbors. I've since went to
aluminum.
Stuff like this...these are usually "cut off" scrap
HTML http://www.ebay.com/itm/1pc-New-100mm-Long-Dia-50mm-2-PTFE-Teflon-Round-Rod-Bar-/290951521113?hash=item43be0fe359:g:-~MAAMXQTT9RsTzm
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