sieg sc3 mini lathe precision ?

hi !

i need to make some small parts but precise .

in 1'' length and 0.040'' diameter is one of peaces i will need to make.

i want to make small scale chopper V engine ,and scale u to 1:5 or every measure is divided by 5 ,so i will end up with bunch of small parts

i don't have late or mill yet,but thinking to buy sc3 and sieg X2-3 mill

but first problem is precision of these machines

will these machines be ok for these kind parts ?

thanks

To what tolerance do you need to work? The part you mention is 1mm diameter, and quite long for its diameter, and would be challenging for any lathe as it will bend as you cut it.

When turning something like that to a high standard of accuracy, assuming the lathe is set up properly the result has more to do with the skill of the operator than quality of the machine.

As John says, it's the length:diameter ratio that matters here and the challenge is for the operator, the tool and the technique used - some form of custom travelling steady will help.

Finally, I assume this is a valve push rod (it can't be much else of a tiny V-twin. What about taking an alternative route and using precision ground 1mm silver steel?

Neil

The lathe won't be your issue. It will be making or buy the tooling to make what you want, like a roller box tool to make your pins and things like that.

Neil

Consider the tool that holds the bushing in this video to support the work right next to the tool

Regarding precision, that is up to your ability and selection of the right materiels for each application. Why turn something when it is available in another suitable form.

The mill, fit optical scales and work to .02 or even less.

Clive

Hi Zuji, I have an sc3 and can, when necessary, work to +- 0.01mm with a sharp tool. If a better fit is required then grind or file and paper it.
What will you be using to measure the parts? my calipers only claim 0.005mm (if they are to be believed) and my mic was good to 0.0005" but it's had a lot of use since then.

thanks for answers .

now some more questions ..)

my plan i to use tool that take diamond shape inserts (hate grinding i worked on 4g cnc only so no manual work)

and material will be spring steel (from truck sheet spring)

so question is will i be ok for these kind measures if i go to smaller sc2 and x1 mill too ?

(don't have much space for tools ,plus i live in 4 store building and i'm on third so more weight on stares is huh too )

and second ,any suggestions for precise tools ,for mill and lathe ? for lathe ones that take diamond inserts

thanks again