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#Post#: 39584--------------------------------------------------
cutting edm water jet
By: aclarke Date: May 1, 2014, 10:49 pm
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hoping to have some big end pins cut down while maintaining the
Rockwell hardness of the surface. Need to remove about 5mm,
anyone have experience with EDM cutting or water jet? I'm hoping
to NOT have to finish grind on my lathe to final length. Any
ideas?
#Post#: 39650--------------------------------------------------
Re: cutting edm water jet
By: 3000 FPS Date: May 2, 2014, 11:18 pm
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Sorry Adam I have no experience but try one and see what
happens. It is the R&D that guys like you do that makes this
hobby interesting.
#Post#: 39654--------------------------------------------------
Re: cutting edm water jet
By: 660magnum Date: May 3, 2014, 12:14 am
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It's been 40 years since I was around one but I don't remember
them resulting in a 10 micron finish? The action is done
submerged to keep the oxygen away.
#Post#: 39669--------------------------------------------------
Re: cutting edm water jet
By: aclarke Date: May 3, 2014, 8:36 am
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Going by the machine shop Monday, ill share my findings.
#Post#: 39707--------------------------------------------------
Re: cutting edm water jet
By: Al Smith Date: May 3, 2014, 6:29 pm
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My only experiance has been the usage of burning out broken
carbide taps from production run cast iron engine blocks .Worked
good for that ---most of the time.
#Post#: 39739--------------------------------------------------
Re: cutting edm water jet
By: Reddog Date: May 4, 2014, 11:33 am
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How large in Dia? and what Rockwell?
Waterjets do best with flat surfaces like plate or bar.
EDM wire machines can lop it right off, but won't leave a
polished surface.
Surface grinder or jig ground in a lathe may be the cheapest
option for a good surface finish on RC 55 or higher.
Below RC 55 just face it in a lathe with carbide insert tooling.
Polish in the lathe with a die grinder.
#Post#: 39761--------------------------------------------------
Re: cutting edm water jet
By: aclarke Date: May 4, 2014, 10:44 pm
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The replacement 3120xp big end pin is 18mm and needs to have the
length reduced by 4-5MM before I send it out for
assembly/balancing. Rc60-62. I have a tool post grinder to
touch up the ends after cutting. Not sure if the water jet
would tend to frost the hardened surface adjacent to the cut?
I'm thinking wire EDM might be cleaner?
Adam
#Post#: 39781--------------------------------------------------
Re: cutting edm water jet
By: Reddog Date: May 5, 2014, 12:16 pm
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Sounds like a wire EDM will be the quickest. Have them leave a
few thou to polish in your lathe.
#Post#: 39788--------------------------------------------------
Re: cutting edm water jet
By: aclarke Date: May 5, 2014, 4:29 pm
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Sounds good. Thanks
#Post#: 39817--------------------------------------------------
Re: cutting edm water jet
By: aclarke Date: May 6, 2014, 8:32 am
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Took them to the machine Shop yesterday. They are gonna edm cut
them. Surface finish on some sample pieces he showed me were
quite smooth with a slightly frosted appearance, no need to
finish Machine with the exception of a chamfer to aid in
pressing together
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