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+--- Thread: Kondia FV-1 Head disassembly (/thread-578.html)
RE: Kondia FV-1 Head disassembly - PixMan - 04-06-2015
That should work, it's a fairly high tensile strength though I did find this Australian one:
http://www.ssm.co.nz/sitefiles/4140.pdf
Probably uber expensive stuff there, if you could even find it.
RE: Kondia FV-1 Head disassembly - Mayhem - 04-06-2015
What it the best approach?
1. large enough ø to mill a decent hex and turn the rest down to ø13mm
2. buy the smallest ø that I can find to thread and then either pin and/or weld a larger ø piece from which the hex can be milled?
Option 1 seems wasteful but I have heard of people having issues with pinned drawbars. I know 1018 welds fine but I'm not sure about 4140
RE: Kondia FV-1 Head disassembly - DaveH - 04-06-2015
This is how I did mine.
Pressed the bar into the hex bar (the nut).
Drill a hole thro' the hex nut and the bar c/s the hole both sides.
Press a suitable pin thro' the hole then bash the crap out of it to fill the c/s.
File it finish with some emery cloth. (All 6 faces)
Place it in the lathe to true up the hex ends and a nice chamfer on the hex nut.
DaveH
RE: Kondia FV-1 Head disassembly - DaveH - 04-06-2015
Some drill and tap the Hex nut and screw the bar in. Some use Loctite on the thread and pin it.
DaveH
RE: Kondia FV-1 Head disassembly - Roadracer_Al - 04-06-2015
You could also braze the hex on the bar.
RE: Kondia FV-1 Head disassembly - f350ca - 04-06-2015
4140 welds fine with a low hydrogen rod such as 70018 or mig.
RE: Kondia FV-1 Head disassembly - Highpower - 04-06-2015
700,000 PSI electrodes? Where do you get those from Greg?
RE: Kondia FV-1 Head disassembly - f350ca - 04-06-2015
OOPS
RE: Kondia FV-1 Head disassembly - Highpower - 04-07-2015
Just don't call me Steve....
RE: Kondia FV-1 Head disassembly - Mayhem - 04-07-2015
Just read the data sheet that Ken linked to above and obviously missed this the first time around:
Quote:Welding:
Parts should be welded in the hardened and tempered condition. Strength properties of the joint will not be the same as the base metal.
Preheat 300-400ºC. Temper after welding to about 35-50ºC below the recommended tempering temperature.
Filler metal: - FOX CM2-KB electrodes or CM2-IGwire.
For advice in connection with difficult welding, please consult our engineers.
Just called them and got some prices:
1/2" Round (ground) = $7.50 per meter
13mm Round = $6.50 per meter
19mm Hex = $25.00 per meter
I'm thinking of using 1/2" ground for all 3 drawbars and then turning down the diameter for a M12 thread. The tolerance on the ground bar should be good for the 1/2-12 and 1/2-13 drawbars. I would then use the hex bar for the wrench end.
They have a minimum $50.00 order, so I may pick up some 25mm round stock as well. Given that I am going to probably have more use for round stock than hex, having some 25mm stock might be a better choice. The also have off cuts...