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Need some Lathe Work
- Thread starter gjestico
- Start date
While the original post might have just slipped under the radar, I think John’s questions get at the core of things. While I’m sure there are hobby shops that could hit that ID (say, +/- 0.0005”) over the whole length of the part, most would probably struggle.
Could, for example, the ends of the bore hit that ID, with the centre relieved?
(Not volunteering, just trying to help clarify)
Yep. Drawings. Concentricity required with the OD? And tolerances required.
Not clear if the 2 1/2" is the depth of the bored section (bearing mount, say) or the entire length of the tube. Even a most basic sketch, and highlights of the areas that can be done to a looser tolerance, if any, would be enlightening.
I've made some pretty high spec'd parts off of napkin drawings, but they were napkin drawings with realistic tolerance specs, and the parts that wanted a higher spec, were clearly thought out, as well as duly marked out in the scratchings.
And have been presented with projects that were clearly impossible (a towing adapter for a helicopter, based on a prototype that was a weldement of maybe 30 different pieces, that had a slot in it, with square corners. They wanted it machined from solid stock. I was specifically told that I could NOT modify any of the dimensions of the prototype. That one died when they refused to allow me to round out the ends of the slot, so it could be produced with an end mill. We had no EDM access). Another minor horror story was when one of our Engineering Officers arrived bearing no less than 22, 2x2 Post-It notes, each bearing a delicately drawn out component of his idea of the best way to make a small part. Like, he drew out a 3/8 x 3/8 triangular gusset, dimensioned and toleranced... To be arc welded in place...)
Not clear if the 2 1/2" is the depth of the bored section (bearing mount, say) or the entire length of the tube. Even a most basic sketch, and highlights of the areas that can be done to a looser tolerance, if any, would be enlightening.
I've made some pretty high spec'd parts off of napkin drawings, but they were napkin drawings with realistic tolerance specs, and the parts that wanted a higher spec, were clearly thought out, as well as duly marked out in the scratchings.
And have been presented with projects that were clearly impossible (a towing adapter for a helicopter, based on a prototype that was a weldement of maybe 30 different pieces, that had a slot in it, with square corners. They wanted it machined from solid stock. I was specifically told that I could NOT modify any of the dimensions of the prototype. That one died when they refused to allow me to round out the ends of the slot, so it could be produced with an end mill. We had no EDM access). Another minor horror story was when one of our Engineering Officers arrived bearing no less than 22, 2x2 Post-It notes, each bearing a delicately drawn out component of his idea of the best way to make a small part. Like, he drew out a 3/8 x 3/8 triangular gusset, dimensioned and toleranced... To be arc welded in place...)
Once had an engineer send me a spec sheet requiring a 40ft long section of 4" Sch40 steel pipe, epoxy coated and lined. I suggested if they could find me a 75mm tall Temporary Foreign Worker I could have the TFW drag the sandblast hose and nozzle into the pipe to clean the inside. Never heard back...
As mentioned, tolerances, please. I'm a hack, but my machinery could do this depending on how tight you need to 1.403" dimension.
As mentioned, tolerances, please. I'm a hack, but my machinery could do this depending on how tight you need to 1.403" dimension.
Never ceases to amaze me about the knowledge in this group!