Re: [CAD_CAM_EDM_DRO] Re: machine ways

Or then there's this recipe for differential heat treating refractory:

6 parts finely ground fire brick
3 parts superfine iron/steel filings
2 parts silica sand (white sand from foundry supplier)
1 part finely ground charcoal
1 part CMC compound (ceramic supplier)
enough water to give it the consistency of thick cake frosting

Coat the part you want at a spring temper, about 3/8" thick, set aside and come
back in about a day. If there's any cracks, add more and let dry. Heat to
proper temp, (It takes a little longer due to the refractory), and quench. The
coated section comes out at a spring temper as the heat stays longer there,
while the exposed steel will be full hard, Samurai sword style.

That one comes from Dr. Jim Hrisoulas, Col USMC (ret), "The Complete
Bladesmith". For those interested in the hot work side of the shop, I can
highly recomend his books and tapes. These used to be available at
www.greenduck.com, but they don't seem to exist any more. The tapes may still
available through Paladin press, but I'm not sure. Amazon has the books.

Bill

On Sat Jan 5 13:30:27 2002, Smoke, <smoke@...> wrote:

>If you want a good spring temper...use lead!
>First you melt a pot of lead, then you submerge the part in the melted lead.
>How long will depend on the size of the part. At least that's the way I
>learned to make flat gun springs.
>Simple, effective and cheap! Just be sure to do the lead melting in a well
>ventilated area.
>
>Smoke
>
>----- Original Message -----
>From: "Bill Vance" <ccq@...>
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Sent: Saturday, January 05, 2002 1:39 PM
>Subject: Re: [CAD_CAM_EDM_DRO] Re: machine ways
>
>
>> Bearing in mind that hardness/temper can be an issue. After Heat
>treating, most
>> steel parts up to a foot or two long can be minimally tempered by placing
>them
>> in an oven set at 3-4 hundred degrees for an hour or two. Minimally means
>that
>> the hardness will mostly remain while the brittleness is drawn down. Not
>quite
>> a true spring temper, but closer than full hard. Good for blades and most
>other
>> sharp stuff, in that it will retain an edge fairly well. Your mileage may
>vary
>> on machine tooling, however, as I haven't done anything like that. For
>> differential heat treating, you probably wouldn't want to do it at all, as
>it
>> might weaken the spring temper section, and soften the full hard section
>of
>> whatever you're working on.
>>
>> Bill
>>
>> On Sat Jan 5 11:13:36 2002, Smoke, <smoke@...> wrote:
>>
>> >Speaking of plastics for use on ways:
>> >
>> >I was reading the other day how PTFE is put on ubiquitous pots and pans
>> >since it sticks to almost nothing. It is sprayed on and then baked.
>> >
>> >This lead me to wonder 'suppose (during manufacture of course) one were
>get
>> >a can of spray on PTFE and apply it to the sliding parts and bake them
>in
>> >an oven'. That, combined with normal lubing should make for some pretty
>low
>> >friction coefficients. An extra boon would be no extra machine work
>would
>> >be required.
>> >
>> >Sounds like a good experiment to try (with some small parts of course).
>> >
>> >Smoke
>> >
>> >> ubiquitous(means everywhere!).
>> >>
>> >> 2)PTFE- (PolyTetraFluoroEthylene) also called teflon, VERY soft, when
>> >> used for linear bearings it is backed up with a harder material and
>> >> used in very thin layers. The slippery-est (lowest friction co-
>> >> efficient) stuff we have so far in commercial quantities.
>> >
>> >> Ballendo
>> >
>> >
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>> >
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--
----------------------------------------------------------------------------
RKBA! ***** Blessings On Thee, Oh Israel! ***** 4-19!
----------------+----------+--------------------------+---------------------
An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no
weapon in every | by COLT; | -- Max Plank | weapon sell his
hand = Freedom | DIAL | In the beginning was the | garment and buy a
on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ
----------------+----------+--------------------------+---------------------

Constitutional Government is dead, LONG LIVE THE CONSTITUTION!!!!!

----------------------------------------------------------------------------