Persevering through a dificult job

[nickel-city-fab]

I finally got it. On the 3rd attempt. I made a proper fitted screw of 8mm dia x 1mm pitch, left-handed. Screw is ~50mm overall with 35mm threaded portion. Used to retain the Jacobs 14N ball-bearing super-chuck, on my Milwaukee M18 hammer-drill-driver. The main thread is 9/16-18, the left-handed metric screw is to retain the chuck while in reverse. Made the screw out of 1/2" 0-1 drill rod AKA silver steel (similar to 42 CrMo)

Still need to make the screwdriver slot.

Motivation: online vendors wanted up to $140 for this screw. Yes, there are left-handed screw suppliers.

Entire job done on a 1945 South Bend 9A lathe with metric change gears. I simply leave the half-nuts engaged and reverse the motor. Used a thread pitch mic to get it right on the 3rd attempt. First two attempts were a complete circus (dull tools, disengaged the half nuts, need to reverse the lead screw, etc etc. didn't work to the pitch diameter -- even if the OD is perfect it still won't go,)

FINALLY got it.......

[chipmaker4130]

Congratulations! Although I have metric gears for my Sheldon, I avoid using them as much as possible.

[RMinMN]

I finally got it. On the 3rd attempt. I made a proper fitted screw of 8mm dia x 1mm pitch, left-handed. Screw is ~50mm overall with 35mm threaded portion. Used to retain the Jacobs 14N ball-bearing super-chuck, on my Milwaukee M18 hammer-drill-driver. The main thread is 9/16-18, the left-handed metric screw is to retain the chuck while in reverse. Made the screw out of 1/2" 0-1 drill rod AKA silver steel (similar to 42 CrMo)

Still need to make the screwdriver slot.

Motivation: online vendors wanted up to $140 for this screw. Yes, there are left-handed screw suppliers.

Entire job done on a 1945 South Bend 9A lathe with metric change gears. I simply leave the half-nuts engaged and reverse the motor. Used a thread pitch mic to get it right on the 3rd attempt. First two attempts were a complete circus (dull tools, disengaged the half nuts, need to reverse the lead screw, etc etc. didn't work to the pitch diameter -- even if the OD is perfect it still won't go,)

FINALLY got it.......

From the price you mentioned I think there are underhanded screw supplier too.😡

[nickel-city-fab]

From the price you mentioned I think there are underhanded screw supplier too.😡

I'm not sure that they are under the hand, they may be under something else. The cheapest I found was $36 ea in grade 10.9 with a hex head that I would have to modify to suit.

[A.K. Boomer]

I finally got it. On the 3rd attempt.
Motivation: online vendors wanted up to $140 for this screw. Yes, there are left-handed screw suppliers.

I]

Talk about getting screwed --- good for you, maybe you inquired about it and now their a little nervous that your not going to get it from them and will offer it to you for 120,,,

then you can tell them to "die with it" always a good line to use in a situation like that...

[wierdscience]

Why did MW go to a 9/16-18 when 5/8-16 has been the standard for decades? Planned obsolescense?

[nickel-city-fab]

Why did MW go to a 9/16-18 when 5/8-16 has been the standard for decades? Planned obsolescense?

For handheld drill chucks, I thought the standard was 1/2-20.?? I think they went 9/16-18 just as a form of vendor lock-in. The newer models are indeed using 1/2-20 (the industry norm)That said, the quality of their machining and manufacturing on the internal components was excellent IMHO.

[Beazld]

Did you check E replacement parts? They show replacement chuck screws for M-18 hammerdrills around 3 bucks. What’s the model number on your drill?

[wierdscience]

For handheld drill chucks, I thought the standard was 1/2-20.?? I think they went 9/16-18 just as a form of vendor lock-in. The newer models are indeed using 1/2-20 (the industry norm)That said, the quality of their machining and manufacturing on the internal components was excellent IMHO.

Ya, 1/2-20 is one 5/8-16 is the other, that's why I was wondering.

[nickel-city-fab]

Yes, in fact that was the first place I looked. I have the original screw, the problem is that it is about an inch too short for the Jacobs chuck, compared to the piece of crap that Milwaukee used. The Jacobs chuck is much larger.

Did you check E replacement parts? They show replacement chuck screws for M-18 hammerdrills around 3 bucks. What’s the model number on your drill?

[mickeyf]

A man after my own ... Heart? Pocketbook? I probably would have made it myself as an act of protest even if they wanted 5 bucks for a lousy little screw. About the 5/8 vs 9/16 ... It is possible that someone actually did some engineering math and determined that 5/8 was overkill, size-wise. Less material, gotta be cheaper, right?

[boslab]

Well done, the good thing or why I like cutting LH is the tool is trundling towards the tailstock instead of the Chuck, getting some good steel, tried a bit of cold rolled once, really ragged, looked like a beaver made it, I use bright drawn mild steel these days
mark

[nickel-city-fab]

A man after my own ... Heart? Pocketbook? I probably would have made it myself as an act of protest even if they wanted 5 bucks for a lousy little screw. About the 5/8 vs 9/16 ... It is possible that someone actually did some engineering math and determined that 5/8 was overkill, size-wise. Less material, gotta be cheaper, right?

In fact, I think Milwaukee engineering is pretty good. Certainly the manufacturing was good too. 5/8 is definitely overkill for a chuck that maxes out at 1/2". but I did notice that the spindle seemed to be made of some hardened and ground material, threads were shiny and smooth, and they resisted the file.

[Black Forest]

I am going to check tomorrow at my screw shop. They carry everything. They will probably want me to buy a box of them. I'll see and let you all know.

[Beazld]

Yes, in fact that was the first place I looked. I have the original screw, the problem is that it is about an inch too short for the Jacobs chuck, compared to the piece of crap that Milwaukee used. The Jacobs chuck is much larger.

Got it! Good to replace the POS chuck.