Author Topic: cutting edm water jet  (Read 380 times)

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Offline aclarke

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cutting edm water jet
« on: May 01, 2014, 11:49:31 pm »
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?

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Re: cutting edm water jet
« Reply #1 on: May 03, 2014, 12:18:14 am »
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.
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Offline 660magnum

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Re: cutting edm water jet
« Reply #2 on: May 03, 2014, 01:14:04 am »
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.
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Offline aclarke

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Re: cutting edm water jet
« Reply #3 on: May 03, 2014, 09:36:51 am »
Going by the machine shop Monday, ill share my findings.

Offline Al Smith

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Re: cutting edm water jet
« Reply #4 on: May 03, 2014, 07:29:35 pm »
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.

Offline Reddog

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Re: cutting edm water jet
« Reply #5 on: May 04, 2014, 12:33:05 pm »
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.

Offline aclarke

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Re: cutting edm water jet
« Reply #6 on: May 04, 2014, 11:44:16 pm »
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

Offline Reddog

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Re: cutting edm water jet
« Reply #7 on: May 05, 2014, 01:16:41 pm »
Sounds like a wire EDM will be the quickest. Have them leave a few thou to polish in your lathe.

Offline aclarke

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Re: cutting edm water jet
« Reply #8 on: May 05, 2014, 05:29:53 pm »
Sounds good. Thanks

Offline aclarke

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Re: cutting edm water jet
« Reply #9 on: May 06, 2014, 09:32:44 am »
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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