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| How Do I Machine Hardened Steel on the Lathe? |
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| snub:
I'm working on a Chevrolet engine and my timing chain gears are not aligning. I need to remove .025" from the backside of the crankshaft gear. I have an old gear to practice on before I attempt to destroy the new one. It is hardened steel and I'm not having any luck. I'm using a carbide bit (well they claim it is carbide). All I got was sparks and smoke so I went and bought a new insert. Still no luck. My digital read out said I took off .010" but I actually only took off .005". I believe I took .005" off the bit itself by eyeballing it. Another problem is those darn keyways. You can hear it hitting each one and my new gear has 7. I'm also wondering if I have the correct angle for the bit. Anyone have a pic of the correct angle when facing with one of these? Here are the bits I am using: And here is what the gear is looking like. Not very good at all: So I'm wondering if there is something better than Carbide or is it just that these bits are crap. They are about $10.00 each so maybe I'm expecting too much from them. |
| patuca:
Hi snub: Pretty hard stuff to cut. If it was me, I'd say it's a job for a tool-post grinder.... I've seen die-grinders in homemade toolpost mounts that would work. patuca |
| markball2:
Hardened steel needs a grinder to remove the material. Even carbide tools won't cut it without annealing the gear. That would allow the removal of the material, then the requisite hardening of the gear. Might be less troublesome to purchase a new gear of the correct thickness. |
| Arbalist:
--- Quote from: patuca on September 07, 2014, 10:47:22 PM ---Hi snub: Pretty hard stuff to cut. If it was me, I'd say it's a job for a tool-post grinder.... I've seen die-grinders in homemade toolpost mounts that would work. patuca --- End quote --- Yes, grinding is the way to go I reckon as well. |
| chipenter:
How about an oil stone set the tool post square and gently push , with some wood or ply as soffener between the post and the cross slide , as with grinding cover the ways and clean up as soon as its finished . |
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