[AT] Heat treating tractor parts

[Dean VP]

Two of these threaded shafts plus threaded forks are used to connect the
rock shaft lift arms to the draft arms of a 50 plus year old three point
hitch. So the tension on the rods is the full weight of the implement which
could be as much as a 4 bottom plow. I would guess maybe worst case a 1,000
lb implement load shared by these two rods. I don't know what the cantilever
effect is on the forces. However, one needs to over design for the shock of
the implement bouncing around in the raised position over rough ground. 

The threaded shafts are not over 1' long and maybe only 3" or so not
threaded with RH & LH threads There are no grooves or shoulders on the rods
other than what is caused by threading them. In fact, most of the damaged
originals I have seen have cracked or broken where the threading ends toward
the center of the shaft. The threading seems to create a weak point at that
area.  

Dean A. Van Peursem
Snohomish, WA 98290

I'm a walking storeroom of facts..... I've just lost the key to the
storeroom door 


www.deerelegacy.com

http://members.cox.net/classicweb/email.htm



-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Jim and Lyn Evans
Sent: Thursday, March 17, 2005 3:36 AM
To: 'Antique tractor email discussion group'
Subject: RE: [AT] Heat treating tractor parts

How much load does the shaft have to take?  Are there any grooves or
shoulders (other than the threads) that might cause some stress risers?

Jim 

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dean VP
Sent: Wednesday, March 16, 2005 8:20 PM
To: at at lists.antique-tractor.com
Subject: [AT] Heat treating tractor parts

I would like some help from experienced metal fabricators.  I would like to
know how much increased durability/strength "heat treating" a 1" round steel
shaft, threaded at both ends would offer.  The shaft is primarily under
tensile forces only but the forces are severe in actual application. The
threaded ends of the rods are RH and LH threads and are inserted into
threaded cast forks at each end. Kind of like a turnbuckle. 

I am trying to have these fabricated at a local machine shop however, in
order to heat treat economically they need to be heat treated in batches of
50 each which is a larger quantity than what I would like to produce at one
time. If not done in a relatively large batch the heat treating becomes a
too significant part of the overall manufacturing cost. 

What am I gaining in this application by heat treating or what am I losing
by not doing so?

I have been advised to use 4340 steel, heat treated RC40 or 1018 steel not
heat treated.  Help, I'm not a metallurgist. These would be for resale so
there is an inherent responsibility to do it right. 

Any help is appreciated.

Dean A. Van Peursem
Snohomish, WA 98290

I'm a walking storeroom of facts..... I've just lost the key to the
storeroom door 


www.deerelegacy.com

http://members.cox.net/classicweb/email.htm






_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at

_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at