Machinist's Minutes: Metallurgical problems with repairing case-hardened shafts

[@DannyFinley-qg9ct]

Thanks for the great information. I like how you use real world examples and express them in a down to earth way. I really enjoy your videos!

[@sshep7119]

Leave an electric engraver next to the saw, every piece gets a part number that corresponds to paperwork in the office. Engrave of both ends and the middle: PN, type of material, diameter. When you cut a piece engrave it if you aren't using it right then or for a job. LOTS of shops have literal TONS of unknown material in hand because the identifying marks were lost. The exotics and such can be XRF scanned for ID by most scrap yards, but XRF doesn't identify carbon content which is most important.

[@greasemonkey060]

Love the ties to the PNW, I grew up in Vancouver. Got married and moved away before enrolling in Clark’s machining classes. Did a lot of work for Oregon Induction company in Portland. They case harden and heat treat all the gears for warn winches. Watching them dunk the parts into an oil quench was satisfying to watch!

[@HOWEES]

In 1979, I had beaver heat treating in Portland case harden a shaft for me & they happened to be doing a damage assessment on some Warn Winch parts, that had failed. Beaver was the most accessible heat treater, that I could find at that time. They charged by the pound & it was around $20.00 for the job, they had open vats of sodium cyanide for imparting the case on a continuous run of one-off parts for small shops.

[@kyleroenigk6530]

guide pins used in the stamping dies at my workplace were casehardened 52100.

[@northmanlogging2769]

I'm near seattle/everett WA, we have several "specialty" yards, so you have to call around a little bit to get what you need, but with BOeING near by I'm a little spoiled

[@HOWEES]

Too bad they quit making many part in-house & shut down Boeing Surplus outlet store. The online doesn't have nearly the stuff that the old store did.

[@northmanlogging2769]

@HOWEES the brick and mortar store was a dangerous place with a pocket full of pennies lol

[@StevenJevnisek]

Hi Howie: Regarding the color code issue, ASTM sjould go to a standard color code using the color code used to identify discreet electronic components like resistors. One band for each alloy number following a gold band that identifies the beginning of the code sequence. Regarding alternatives to flame spraying, what if one undercut the damaged section and laid in hardface weld material using a rotary weld positioner?

[@stevensnyder5332]

Good Morning from Louisville Ky.

[@FFLFFS]

Howie 13:49 brings me back to several arguments over the years, I had with people debating what T1 actually meant. Nobody ever told me it had two different meanings.🤦‍♂️🙄👌 😂

[@MrKidkiller159]

Funny you mention Camas Washington. I'm in Vancouver.

[@UbrShadow]

I currently work with a lot of 316 stainless, Monel, Inconel, Hastelloy. Any experience with exotic steels like those? I believe Monel and Inconel have a lot of nickel in it.

[@HOWEES]

316 is pretty common. I love inconel 625 for what it can be, total PIA to get it in that shape. I don't have much experience with e Hastelloys.

[@Blazefork]

The neighboring town has a salvage yard with an abundance of drop shafting and mechanical tubing at 20¢ a pound....I have to exercise self control when I go there lol.

[@Phantom-mk4kp]

What about hard facing welding rods up to 60c

[@EitriBrokkr]

Did you listen to anything the man said?

[@Phantom-mk4kp]

​@@EitriBrokkrNever heard hard facing mentioned, nearest was HSS repair alloy, but not available, so irrelevant. Point to the time where he said it and I'll delete the comment

[@HOWEES]

I had a few days ago thought of mentioning hard facing rod, I forgot during the video. The hard facing rods will be a hard surface, but it will not be smooth & consistent enough when done so the rollers will get damaged, similar to the flame spraying. The hard facing is also known for developing cracks, in fact many of the rods suggest, that you quick quench to promote cracks, so that any pieces that brake off will be small, this works great for rocks & gravel, but not for rollers. Some other hard facings will state to not quench & instead run small noncontinuous beads, Do not quench unless you know it is the best method.

[@Phantom-mk4kp]

@@HOWEES Thanks for explaining that,👍

[@melgross]

@@HOWEESof course, we see Abom doing flame spraying all the time for shaft reworking. Mac Grant does it as well. Then they machine to size. Are you saying that they maybe shouldn’t doing this? The bearings being used as far as I know aren’t needle bearings, but either roller or ball with an inner race. That should be fine, unless you think that material can crumble under load.

[@melgross]

The whole thing is confusing. Yes, I get 1018 and 1020 in green, but also in yellow. 4140 often is red, or, red and black. Others can be anything. Many others have no colors and if I don’t remember to put down what it is, I sometimes forget. There it a handheld device out there that will tell you the composition of the material is with a list of the ingredients, with percentages. It will also read non metallic materials. I forget the name of it right now, but it’s pretty expensive. Not for a small shop, but for big steelyards and manufacturers, it’s a big money saver.

[@channelview8854]

XRF X-Ray Fluorescence

[@northmanlogging2769]

the AR plate stuff I find amusing, folks get all googly eyed over it, and yea its tough stuff, but its not the be all that they think it is, its not hardened, its not even very hard, it is tough, and stands up to repeated abuse... because its meant for it... the A R means Abrasion Resistant, not tool steel, not hardened, not bullet proof... but dudes will drop their cash on it all day i guess?

[@mikec.9177]

Heat the shaft up and smoke it with acytelene

[@HOWEES]

A quick smoking with acetylene will not do any thing, but if you could both keep the temperature up & add the acetylene (under pressure) it would case if given 1/2 hour or more, but very hard to control & expensive.

[@eweunkettles8207]

bone meal , leather cuttings hoof trimmings were used by jobbing fitters in the old jute mills local to me . water wheels , then steam in the summer months