Using unhardened O 1 tool steel for keystock material? Why?

[EmGo]

Multiple sets of herring bone gears. I don't even know how these were cut and ground. Beautiful work.

If they are really herringbones - continuous teeth ? then they had to be made on either a Sykes or a Sunderland shaper. Probably have some video on you boob. On both of those one cutter supposedly makes the clearance for the other direction ... but in fact they both go solid into the vee, so they have to go pretty slow.

If they are ground tho, they have a space, normally called double helicals and they can be shaped or hobbed or even done some peculiar way. Hard part there is clearance for the grinding wheel. Those actually work better, except for in a pump.

 

[4GSR]

........................, except for in a pump.

Why do you say that? There are hundred of thousands of Lufkin pump jacks all over the world that have at least one set of herringbone gears in them. I've personally never have seen one fail from day to say use. Lack of maintenance is usually what kills them.

 

[EmGo]

Why do you say that? There are hundred of thousands of Lufkin pump jacks all over the world that have at least one set of herringbone gears in them. I've personally never have seen one fail from day to say use. Lack of maintenance is usually what kills them.

The teeth don't bend evenly. Because of the way they reinforce each other at the v, they don't distribute the load across the face as evenly as the ones with a space. Fine for mud pumps but in submarine transmissions, better performance with the space.

In fact, someone must be aware of that because we had a deal to sell six 2 meter shapers that would relieve in a narrow groove between the halves, then the bottom fell out of the oil prices and our buyer ran away. I hate oil

Another funny thing about those, someone tried making those pump gears as plain helicals and they pulled the sides out of the housings Low speed, big load.

 

[4GSR]

"I hate oil " Get used to it, all of these electric cars and the electricity coming into your shop/home is mostly generated from oil/gas! That is not going away anytime soon, regardless what our Government says.

Now we are getting off topic here. Back to the regularly scheduled program.

 

[EmGo]

"I hate oil " Get used to it

I don't know how you guys put up with it. I've seen at least three total crashes of oilfield. One week you guys are buying Rolexes at retail plus 20%, the next week trying to get $15 for them at the pawn shop. I'd have ulcers on my ulcers.

At least with nuke, you know they are going to need $500 keys once in a while

 

[4GSR]

Yeah, I have ulcers and other elments to show for it!
Just three more years of employment is all I ask for and it's over with for me! If these Indian people I work for don't dump me first.

 

[boslab]

I can’t see a problem, dowels , oh a 1/4 sq lathe tool was in one pulley I pulled, it had been on this jaw crusher for 20 years, nice fit . I’ve found round rod in a square hole, welding rod, bits of brass rod, ( mind I found a 1/4 inch brass rod in a fuse holder once, bet that would take some amps,!
Mark
Ps you would not want to find assorted junk as a key on somthing like the drivetrain of a submarine or in a jet engine, there are places you need to follow the design to the letter of the law!

 

[boslab]

As for traceable steel, it will be traced as far back as a torpedo on a blast furnace, it’s fairly difficult to go back further than that , you may well know the ore origin like San Marco or BHP concentrate on a particular ship but the way ore is layered in stock yards by unloaders it’s a rough idea only, and for the most part irrelevant, the first metallic analysis is the tapping sample on the blast furnace, same as arc, you can’t identify the particular bit of scrap as it’s mixed,
Mark

 

[Luke.kerbey]

as

Do you have to cut a piece off and send it to a lab for material anlaysis?

I worked for a place in the UK that made CO2 scrubbers for nuclear submarines. EVERY piece of material that came thru the door had a piece cut off and sent out for analysis. Regardless of traceability it got analysed

out of curiosity did the supposed traceability cert ever not match the analysis?

 

[EmGo]

I found a 1/4 inch brass rod in a fuse holder once, bet that would take some amps,!

You Brits are so wasteful ! you know most of the current goes through the skin, wrapping the blown fuse in tinfoil works fine !

 

[atex57]

You Brits are so wasteful ! you know most of the current goes through the skin, wrapping the blown fuse in tinfoil works fine !

If you get above 15A it takes two layers.

Ed.

 

[boslab]

Fuse repair when I was a kid was the silver paper out of my dad’s cigarettes ( woodbine if your from over here)
My first use of this was in 1964 to get my train working under the expert guidance (lol) of my grandmother, born when you could, and she did meet wild bill Hickok or buffalo bill when his show was in London (1870somthing) the joke was she learned everything she knew about electricity from sitting bull.
I can smell the Bakelite burning!
Mark

 

[triumph406]

as

out of curiosity did the supposed traceability cert ever not match the analysis?

It rarely matched the foundry analysis exactly.

The Foundry might have poured for arguments sake 20'000#, we may have bought 1000# The lab analysis at the foundry would have been at one specific part of the pour. No gaurentee the material we bought was in the same part of the crucible. I would suspect end each of a bar could be slightly different.

We were ensuring that the material we had was what was ordered, was within the acceptable range chemically for that material. Especially impurities.

Although I can't remember, I would suspect that every piece of material would have been UT inspected as well.

 

[Luke.kerbey]

It rarely matched the foundry analysis exactly.

The Foundry might have poured for arguments sake 20'000#, we may have bought 1000# The lab analysis at the foundry would have been at one specific part of the pour. No gaurentee the material we bought was in the same part of the crucible. I would suspect end each of a bar could be slightly different.

We were ensuring that the material we had was what was ordered, was within the acceptable range chemically for that material. Especially impurities.

Although I can't remember, I would suspect that every piece of material would have been UT inspected as well.

So if I understand, the materials will differ slightly but all within the tolerance for that grade?

 

[triumph406]

So if I understand, the materials will differ slightly but all within the tolerance for that grade?

well that's what your hoping for.

They might have done pull testing as well on the material