# Anyone with a hobby mini-lathe here ?

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#### Externet

##### Active Member
Hi.
If someone plays with a hobby lathe, please let me know if I can have a small piece made to link two rotating items. No machinists nearby my town.
At once, will tell what I need:

One 25 mm long shaft.
Half of its length 5.0 mm diameter.
The other half 7.0 mm diameter.
In any steel.

Will pay, of course. Better if within U.S.

#### jpanhalt

##### Well-Known Member
What type of steel? And even more important, what tolerances?

John

#### Mikebits

##### Well-Known Member
I have a Micro Lathe see below image. As has already been said, you need to provide tolerances. Also, must it be steel? Aluminum is much easier to work with. I can probably do what you want for free, just cover shipping, however I would like to see due diligence on your part, ie. create a drawing.

#### JimB

##### Super Moderator
Not wanting to be left out of this "turning frenzy", I too have a small (3.5inch centre height) lathe.

JimB

#### tcmtech

##### Banned
I have a Micro Lathe see below image. As has already been said, you need to provide tolerances. Also, must it be steel? Aluminum is much easier to work with. I can probably do what you want for free, just cover shipping, however I would like to see due diligence on your part, ie. create a drawing.
He's also got the same request over on AAC as well. https://forum.allaboutcircuits.com/threads/anyone-with-a-hobby-mini-lathe-here.135734/

As with you I'd knock it out for free being its such a simple part and it's easily doable just as a lathe tolerances test and tune procedure when setting up for a larger job.

Someone else over there however feels it worth $100 (with a 50% off discount to other forum members of course). #### tcmtech ##### Banned Most Helpful Member Not wanting to be left out of this "turning frenzy", I too have a small (3.5inch centre height) lathe. JimB I just picked up a antique Burke #4 horizontal mill (late 30 to mid 40's vintage) last week I am fixing up to set up as a dedicated keyway and slot cutting machine so if he needs a keyway cut in it I could do that too! Well, probably not actually being I don't think I have a slot cutter that small. #### Externet ##### Active Member Grateful to your overwhelming response, gentlemen. Tolerance +/- 0.1 mm to diameters, +/- 1mm to length. If any steel is too vague, whatever ironish piece of remnants or stainless will do very well, but not from a broken drillbit shank. Will have little torque and nothing important. Not keyed. Mailing and labor covered; and if you want some free electronic parts on top, make a wish list; I may be lucky and have it. Understand the convenience of a drawing (I would ask the same), but perhaps a picture of a similar piece works: #### tcmtech ##### Banned Most Helpful Member Grateful to your overwhelming response, gentlemen. Tolerance +/- 0.1 mm to diameters, +/- 1mm to length. If any steel is too vague, whatever ironish piece of remnants or stainless will do very well, but not from a broken drillbit shank. Will have little torque and nothing important. Not keyed. Mailing and labor covered; and if you want some free electronic parts on top, make a wish list; I may be lucky and have it. Understand the convenience of a drawing (I would ask the same), but perhaps a picture of a similar piece works: Pretty much what I envisioned. I think any of us with a lathe could knock out one, or several, for you in short order given your dimensions and tolerances. +-.1 mm tolerances is pretty easy to hit. The other week I had to replace the nozzle holder for my used oil burner and given that buying one cost around$20 with shipping now I decided to make my own from a piece of brass hex stock I had that was the same base dimension as the store bought ones.

Once I was set up (took about 20 minutes since my brother used it for making something else entirely different earlier) I could knock one out start to finish to +- .002 tolerances including boring and threading the inside in under 5 minutes each. I only needed one but once I was set up and going it made more sense to make half a dozen now rather than mess with having to set up again some day later if I ever needed another one.

That's one of the annoyances I have with doing basic lathe work. Setup to make something simple often takes more time and effort than making one of even a bunch of something does once everything isset up and going.

#### KeepItSimpleStupid

##### Well-Known Member
I miss the shop I had access to. I would actually expect something like +0.00 mm -0.1 mm so it fits assuming a set screw. I'll bet your length could even be sloppier. Your the boss though. Little things like a chamferred edge like you'd get with a file would make the part want to "find the hole". in any part I made I really never specified the finish.

You could check for fun, Stock Drive Products for shaft reducers. So for like a 1/4 to 1/8 reducer, "they" bore a 1/4 shaft to 1/8 and lop off 1/4 of it so the set screw sees the 1/8 shaft. Precision shafting has high tolerances so it's straight and has a sliding fit through the hole. This is where 0.001 inch over/under reamers come into play when your making gears and bearings.