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| ddkhalaji:
--- Quote from: Jonny on July 18, 2013, 11:38:45 AM ---Never seen an HSS cutter like that before and the source of the problem. Its got no relief apart from top edge you have to grind them up which will only last a few times. Surprised it didn't leave chaff marks even on a robust machine. Have a look on how to grind a tool up. Purely as a means of seeing whether it cuts better swing round the tool about 10 degrees right and power feed backwards towards tail stock. --- End quote --- Hi Jonny, I think the angles of the photos I took of the cutter don't do it justice. It does have front and side clearance. I do plan on grinding my own tools, I have been reading how to run a lathe by south bend, which explains how to grind and the angles of the different tools, and for the different metals.. I'm waiting for blanks to arrive, and buying a bench grinder. Do you or anyone else have advice for buying a bench grinder? --- Quote from: Meldonmech on July 18, 2013, 03:15:07 PM ---Hi, Glad to see you are now getting the smooth finish on your facing. Help is always available on this forum, which has a vast communal knowledge waiting to be passed on. Cheers David --- End quote --- Thank you! :) --- Quote from: vtsteam on July 18, 2013, 04:13:44 PM ---I agree with all the comments so far about hacksawing. I also wonder about why all that paint was missing on the blade for one cut -- unless it was a used blade. If so, try a new sharp one, and for thick stock like that, a relatively coarse tooth. Bimetal blades are nice, too. Spent several years hacksawing before I got a bandsaw. Make sure you have as much tension as you can physically manage on the blade. Now, I hesitate to say this since no one else has and maybe some feel there is a reason not to, but I often sawed round stock in the the lathe while it was turning. You should move the blade back and forth so it doesn't wear the teeth in one spot while doing this, like slow motion sawing, and not apply much pressure. And not all the way through, of course, so you don't have work leaving the lathe, but to within about 1/4" of center. Then I turned the motor off and sawed the rest of the way by hand. Speed should be slow, naturally. Parting off is also good, but learning how to saw seems primary. --- End quote --- Hi VtSteam, yes it was an old blade, it is also a 32 TPI blade as I'm usually cutting thin stock. I was hesitant to saw in the lathe, maybe in later in down the track when I build my confidence I will give it try, thanks for the pointers. I agree with you in learning to saw seem primary. Thank you. --- Quote from: krv3000 on July 18, 2013, 05:49:13 PM ---hi and you is off to a good start well i have cut 100mm bar by hand noproblem :nrocks: --- End quote --- Hi, thanks :) 100mm :bugeye: I better just suck it up then.. |
| AdeV:
--- Quote from: ddkhalaji on July 18, 2013, 06:53:01 PM --- Do you or anyone else have advice for buying a bench grinder? --- End quote --- Buy the most powerful one you can afford. I made the mistake of buying a cheapo one (£20 from B&Q IIRC), as soon as you touched the wheels with a piece of metal it literally ground (haha) to a halt. I'm lucky enough to have 3-phase, so when I landed on an old 3-phase machine, I snapped it up. Cost less than the B&Q heap, and has loads of torque. It also spins on for maybe 10 mins after being turned off, so the bearings are pretty good too... |
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