Machinist Question Machining G7 phenolic

[Graysonhogs]

I've machined all kinds of phenolic but this material has me stumped. Instead of turning, it breaks off, like glass. and if I do manage to part off the piece breaks into two pcs. It's a spacer 15mm od 6 mm id 4mm long. Any help would be appreciated.

[18ncs]

Bump

[UncleBubba]

Machinist Question Machining G7 phenolic

Contact Iscar, they can tell you everything you need to know. I have never run into that grade of phenolic but on other projects they have been a lifesaver. I've even gotten a free tool from them in the past, as they knew I'd need more inserts down the road... Sorry I can't help any more than that.

[Sean]

Is material from plate or bar? Post a pic of it, we make a lot of gears out of phenolic and I've had issues with corners chipping out when the gear hob cuts thru the bottom surface. We started making a steel/aluminum plate under it. As far as a lathe issue I've only had an issue once and that was from using cheap grade material and I was turning it wrong way.

Email or call Boedecker plastics in shiner tx. James is my contact there and he can answer any questions that you would have.

[GrapeApe]

My plastics guy said zero rake tools, preferably diamond, keeping tool edge sharp is important.

Hope that helps.

Looking at the specs for this crap, doesn't look fun. Can you grind it?

Gets harder after heating to 400...can you heat treat before turning to see if it's less shatter/break prone?

[Scoobyh]

I've never ran G7 but I have ran G10. Mostly milling stuff though.
What kind of SFM and feed are you running?
I would think a high positive rake, uncoated, polished aluminum insert would work well.

[kck]

We've machined some of it before. Without seeing the part, all I can offer (and I'm sure you've done this already) is to ease up on the depth of cut and feed rate and keep the spindle speed up. CNC or manual lathe? Collet or jaw chuck? I'm not a fan of jaws on the glass impregnated stuff. The other fellas beat me to the zero rake but, also, are you running carbide tools or hss?

[Graysonhogs]

Carbide zero rake. Round stock 5/8 dia NC LAthe. Was running 875RPM feeding .008. Was only taking .032 off diameter and got this


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[Graysonhogs]

Never had a problem with G10 but this stuff sucks


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[Graysonhogs]

My plastics guy said zero rake tools, preferably diamond, keeping tool edge sharp is important.

Hope that helps.

Looking at the specs for this crap, doesn't look fun. Can you grind it?

Gets harder after heating to 400...can you heat treat before turning to see if it's less shatter/break prone?

I'll give it that a try. We have a heat treat furnace


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[Graysonhogs]

Thanks for the input


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[kck]

Let me check the numbers we run this at and I'll shoot it to you.

[Graysonhogs]

Let me check the numbers we run this at and I'll shoot it to you.

Thank you


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[Goldeneagle]

Sorry I can't help out too much. Haven't run any of that in many years. From the looks of it, I would speed up RPM, slow down feed and take lighter cuts. Good luck with it.

[bbt82z]

We turn G9 and G11 at work. Very low rims was the key for those. Not sure if G7 is comparable.