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Thread: Welding HSS
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8th Aug 2019, 09:11 PM #31Most Valued Member
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The last time I cut a keyway on the lathe, I just used a small piece of HSS blank. I ground it down to the size needed and put it straight in the tool holder. Apart from the cutter clearance angles, which was ground in the tool, the rake was adjusted by rotating the toolpost.
The fiddliest bit was ensureing the tool was cutting at the correct height to ensure a symmetrical groove but that was done by eye anyway and it turned out fine.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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8th Aug 2019, 09:22 PM #32Pink 10EE owner
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Also sometimes it works better if you have two cutters, a narrow one and a finishing tool.
Might repost the link to this book. https://www.dropbox.com/s/f48ewsbh13...20slotting.pdfGold, the colour of choice for the discerning person.
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9th Aug 2019, 03:26 AM #33
Hi Guys,
When I did my keyways, I locked the spindle with the backgear and rotated the work piece until it was positioned where I wanted the keyway to be. Setting centre hight was quite easy.Best Regards:
Baron J.
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9th Aug 2019, 10:27 AM #34Most Valued Member
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Yes it is a slow way to do a keyway because a lathe is not designed for this, so patience is needed
to nibble your way through the job.
You need to do more passes at the same DOC to clean up the taper, the lathe also would probably be flexing.
You will quickly wear a flat at the cutting edge if you drag the tool back through the cut, effectively
removing your tool relief, have look with a magnifying glass.
As Simon said earlier you can rotate the tool around a bit and regain some clearance.
To stop this happening you need to back the tool away from the work on the return stroke then reset your DOC
for the next cut.
cheers, shed
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11th Aug 2019, 11:12 PM #35
Thanx RC
Don't remember seeing this book when I was in the green.Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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12th Aug 2019, 11:22 PM #36Most Valued Member
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Um hope i can explain this well
An idea that i have done befor is press a plug into the gear so that it is like the gear has no hole.
Then center punch the gear where it joins the plug. Drill a hole the same diameter or slightly smaller than the size of the key. Press the plug back out of the gear hole. Now tou have a half round key way nearly the right size in the hole of your gear.
Finish this to a square key way either by
Using your lathe as a slotter. With a boring bar or carfully filing the half round slot into a square key way.
Ive used this method successfully a few times.
To fashion a boring tool thats suitable use round hss in a piece of bar secured buy a grub screw. As suggested buy others im sure.
Also i have some home made boring tools that are simply hss arc welded to the end of a piece of bar. I didnt make them but they work fine.
Aaron.
Diy or die.
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14th Aug 2019, 12:14 PM #37Senior Member
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I did as suggested by moving the cutter away before withdrawing it each time, and had better success. I kept the cuts at .002 or less.
The cutter was blunting way too fast originally so I'd say the heat from silver soldering it had ruined the hardness of the HSS. I've done a similar thing many times before by using a 60deg HSS cutter to make finger grips on the outside of knobs I made and never had the cutter blunt at all and I never moved the cutter away before withdrawing it during the process.
The blanks turned out really good but I did find the key slot narrowed a smidgen as it got to the bottom. That's from wear in the width of the cutter, so I had to finish them with a 3 cornered file.
P1040040.jpg
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21st Aug 2019, 02:40 PM #38Senior Member
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Getting a lot closer to cutting these gears now.
The shaft is 10mm spigot at the bottom, 12mm at the top, 18mm for the gear blank and 16mm threads (because I can cut 2mm pitch with the gears I've got).
Shaft between centres and a drive dog.
P1040042.jpg
P1040043.jpg
Actually, I got really lucky here. The last thing I did to the shaft was the top thread. I almost had it finished when I noticed the drive dog was loose.....Could have ended up with a really screwed up thread and ruined the whole thing.
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21st Aug 2019, 09:10 PM #39Senior Member
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- melbourne
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21st Aug 2019, 10:03 PM #40
Nice save, I hate when things go wrong after so much work.
I was turning a m6 LH thread 30mm long in stainless steel on the lathe about a month ago, just for a trial peice while waiting for a L/H die from AliExpress.
I knew it was a pushing it since I was not using a center to support it, then the 2nd last cut it climbed the HSS and wrecked it completely.
Lesson leason learnt, don't be lazy, lolUsing Tapatalk
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21st Aug 2019, 10:17 PM #41Most Valued Member
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I tig welded a 6x6x100mm hss tool i had cut 10mm off one end and welded it onto the tip for boring on the lathe it worked really well but i ground the point the wrong way lol it has been the only tool not needing to be sharpen will see if i can find the pic when i get on the laptop its in one of my threads on here
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22nd Aug 2019, 02:51 PM #42Senior Member
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22nd Aug 2019, 02:56 PM #43Senior Member
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By the way .... This gear cutting jig design is by way of a South Australian guy on youtube and he calls his channel Zynudu .
Many thanks to him.
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22nd Aug 2019, 04:55 PM #44Most Valued Member
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Do you have a Mill and Rotary Table with either degree or dividing plates to suit the gears to be cut?
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22nd Aug 2019, 05:23 PM #45Senior Member
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