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Topic: modifying SC shaft (branched off from New Guy...) (7 msgs / 205 lines)
1) From: Paul Helbert
Sean,
If you are doing the same job as I am tonight...replacing the plastic shaft
with a 1/4" bolt, then I figured we might compare notes as we go along. I am
generally following the advice of Will O'Brien athttp://biobug.org/coffee/turbo-crazy/sc-mod/.  He did not make it clear (to
me) the distances or the reasons for some of his washers. Surely sockets
have different depths, bolt heads come in different thicknesses, etc., so
this is to be expected. Here is what I am noticing on an original Stir Crazy
(Cat No. 82306 0146):
The original plastic shaft was a many stepped thing. The uppermost smooth
diameter (excluding the threaded portion) acted as a bearing to keep the
thing centered. Looks to me as if we need a metal or Teflon bushing or
something of the sort to duplicate this centering function. The OD would
need to be about 11/16". I found an old 1/4" drive 1/2" socket with that OD
and am presently trying to work that into the design while messing with the
height adjustment at the motor. You may have noticed by now that the motor's
square shaft arises from a slight boss requiring that the 7/16" socket be
recessed to compensate when assembled. Just fiddly fitting stuff.
How's it going with yours?
Paul
-- 
"There is nothing- absolutely nothing-
half so much worth doing as simply
messing about in boats."
---Ratty to Mole in Kenneth Grahame's
  The Wind in the Willows
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2) From: Paul Helbert
Here are links to photos I took of this evening's SC shaft replacement:http://home.rica.net/phelbert/100_2427.jpgFrom top showing socket used as
centering bushing.http://home.rica.net/phelbert/100_2429.jpgWhat looks like a ring in the
socket is a pair of jamb nuts.http://home.rica.net/phelbert/100_2430.jpgThe jamb nuts are up inside the
centering socket.http://home.rica.net/phelbert/100_2434.jpgThe whole assembly out and
upside-down.http://home.rica.net/phelbert/100_2436.jpgThe shaft assembly is only held
down by gravity, but works fine.
I may only leave these photos up for a few days because my storage on this
account is already too full.
I'm open to suggestions for better places to post pictures.
Tnx,
Paul
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3) From: Sean Cary
I was poking around last night as well - found the same socket link and
changed my plans based on that.  I was going to drill the plastic bolt out
(I have a drill press...) and then place a new bolt in with JB Weld.  Simple
and keeps that bearing surface you are referring to - that is the backup
plan in case the uber mod does not go as planned.
What I am now thinking - JB Weld the bolt into the socket and then run two
nuts on the shaft and locate a SS washer _under_ the opening in the pan to
act as a heat guard/guide...then a washer and a nut and washer to hold that
down and to pinch the stirring arm.  Thinking I may use my dremel to cut a
groove in the top nut/washer combo if I  can to trap the stirring arm.   I
will take pics if it comes out as I envision it.
Some folks have used a copper cover as a heat guard, but I think it was
Alchemist John who put some info about about the potential copper has for
toxicity...not wanting to willingly induce more toxins in my body, over the
years the USMC has been good and ensuring I get them w/o even trying!  (we
were told that the air in Fallujah was no worse the breathing a camp
fire...but I am not sure who burns plastics and other hazmats in an open pit
while they are camping.)   ANYWAY...
Off to HD after church today.  I have my SC apart and cleaned up - going to
get an AC switch to isolate the heater from the motor, I want the ability to
kick the heater in if it is cold in the garage when I am roasting...as it
was in VA when we lived there.  Gotta be careful, i cracked my other SC last
year trying to drill a whole for the same reason.
Sean
On Sat, Mar 1, 2008 at 10:34 PM, Paul Helbert 
wrote:
<Snip>
-- 
Sean M. Cary
Major USMC
Tempus Fugit, Memento Mori
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4) From: Ron Feroni
Hey guys whats up?
 
        I too have a SC/TO and did the shaft mod about a year and a half ago.  I can't remember the exact details but in a nutshell it uses sockets, JB weld and some washers along with a 1/8" steel stir rod with nothing else connected to it.
 
       One thing I have learned is that with a rod this big it is hard to do smaller batches(I.E. say less than 1/2 pound).   Reason being it just 'pushes' the coffee around.  I've been wanting to make another whole assembly using a smaller diameter rod(like the one that came with the SC that I threw out)to see if this helps.  I also saw where someone made two arms so essentially he had a four way stirring rod.  I like this idea also.
 
        Sean,  I would also like to seperate my heating element and such to get better heat control.  Are you going to use a variac or the like?  I'm getting tired of having to sit there and continually man-handle the knob.  The degree variation on my TO is around 80-100*!  This is ridiculous!
 
I will be watching to see what comes of this....
 
Ron > Date: Sun, 2 Mar 2008 08:24:51 -0500> From: smcary> To: homeroast> Subject: Re: [Homeroast] modifying SC shaft (branched off from New Guy...)> > I was poking around last night as well - found the same socket link and> changed my plans based on that. I was going to drill the plastic bolt out> (I have a drill press...) and then place a new bolt in with JB Weld. Simple> and keeps that bearing surface you are referring to - that is the backup> plan in case the uber mod does not go as planned.> > What I am now thinking - JB Weld the bolt into the socket and then run two> nuts on the shaft and locate a SS washer _under_ the opening in the pan to> act as a heat guard/guide...then a washer and a nut and washer to hold that> down and to pinch the stirring arm. Thinking I may use my dremel to cut a> groove in the top nut/washer combo if I can to trap the stirring arm. I> will take pics if it comes out as I envision it.> > Some folks have used
  a copper cover as a heat guard, but I think it was> Alchemist John who put some info about about the potential copper has for> toxicity...not wanting to willingly induce more toxins in my body, over the> years the USMC has been good and ensuring I get them w/o even trying! (we> were told that the air in Fallujah was no worse the breathing a camp> fire...but I am not sure who burns plastics and other hazmats in an open pit> while they are camping.) ANYWAY...> > Off to HD after church today. I have my SC apart and cleaned up - going to> get an AC switch to isolate the heater from the motor, I want the ability to> kick the heater in if it is cold in the garage when I am roasting...as it> was in VA when we lived there. Gotta be careful, i cracked my other SC last> year trying to drill a whole for the same reason.> > Sean> > On Sat, Mar 1, 2008 at 10:34 PM, Paul Helbert > wrote:> > > Sean,> >> > If you are doing the same job as I am tonight...replacing th
 e plastic> > shaft> > with a 1/4" bolt, then I figured we might compare notes as we go along. I> > am> > generally following the advice of Will O'Brien at> >http://biobug.org/coffee/turbo-crazy/sc-mod/. He did not make it clear> > (to> > me) the distances or the reasons for some of his washers. Surely sockets> > have different depths, bolt heads come in different thicknesses, etc., so> > this is to be expected. Here is what I am noticing on an original Stir> > Crazy> > (Cat No. 82306 0146):> >> > The original plastic shaft was a many stepped thing. The uppermost smooth> > diameter (excluding the threaded portion) acted as a bearing to keep the> > thing centered. Looks to me as if we need a metal or Teflon bushing or> > something of the sort to duplicate this centering function. The OD would> > need to be about 11/16". I found an old 1/4" drive 1/2" socket with that> > OD> > and am presently trying to work that into the design while messing with> > the> > height adjustment 
 at the motor. You may have noticed by now that the> > motor's> > square shaft arises from a slight boss requiring that the 7/16" socket be> > recessed to compensate when assembled. Just fiddly fitting stuff.> >> > How's it going with yours?> >> > Paul> >> >> >> > --> > "There is nothing- absolutely nothing-> > half so much worth doing as simply> > messing about in boats."> > ---Ratty to Mole in Kenneth Grahame's> > The Wind in the Willows> >> > Homeroast mailing list> > Homeroast> >> >http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comShed those extra pounds with MSN and The Biggest Loser!http://biggestloser.msn.com/Homeroast mailing list">http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com>>> > > > -- > Sean M. Cary> Major USMC> Tempus Fugit, Memento Mori>> Homeroast mailing list> Homeroast>http://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.comShed those extra pounds with MSN and The Biggest Loser!http://biggestloser.msn.com/Homeroast mailing list
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5) From: Paul Helbert
The jamb nuts inside the centering socket are shown. Also, you can now see
the imprint of the sweeping wire on the top washer:http://home.rica.net/phelbert/100_2442.jpgYou can also see the socket on the motor shaft in the bottom of the SC
center hole.
I also removed half of the barrier strip spacers in alternate pattern to
allow improved stirring.
I cut the heater wires off close to the socket. Easily reconnected if ever I
need extra heat. The trick drilling plastic is to regrind the bit to a
steeper angle than what you'd use for metal.
It's sunny and getting up to 50F this afternoon. I'd better go check out the
river and let this project go 'til tonight.
-- 
"There is nothing- absolutely nothing-
half so much worth doing as simply
messing about in boats."
---Ratty to Mole in Kenneth Grahame's
  The Wind in the Willows
Homeroast mailing list
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6) From: Sean Cary
I was hoping not to have to mod the SC too much...but cannot find a 7/16th
socket that fits the existing hole...  I got a 1", 1 1/4" and 1 1/2" SS 1/4
bolts and some large washers at True Value this morning (The Depot sucks for
specialty hardware...when did that happen?)
Dremel up!  I need to punch a hole for the heater control anyway.
Demo of a bathroom and backer board install this morning, tile 24 hours
later...finishing the cabinets in the garage, unpacking from the move last
Jun...trying to figure out when my dad is going to succumb to cancer.  And
now my roaster...  Good thing I have my Dhabolten roaster - guess I could
heat gun some if I had to in a pinch.
Also have to figure out how to get a 2003 HD Screamin Eagle Road King from
Tucson to NC before April...  Freaking expensive to ship a bike!  That and I
don't want to take it from my dad - has this sense of finality to it...this
thing is his pride and joy. (Huge Sigh)
Sorry for the ramble...lots going on.
Sean
On Sun, Mar 2, 2008 at 10:36 AM, Ron Feroni  wrote:
<Snip>
-- 
Sean M. Cary
Major USMC
Tempus Fugit, Memento Mori
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7) From: Paul Helbert
Sean,
That hole (in the plastic) needs to be enlarged for the socket. SOP.
On Mon, Mar 3, 2008 at 11:46 AM, Sean Cary  wrote:
<Snip>
-- 
Go fly a kite.
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