Development of original round surfaces

knickly · Dec 13, 2017

Hello all,

One of my particular interests is the creation of precision parts without a precise like part. I've seen lots of information about the three plates method for making surface plates. What I've not seen much about is the creation of round parts.
How was this accomplished? Can an imperfect part be lapped to round? Would one measure in a vee-block, and progressively remove the high spots?

DMF_TomB · Dec 13, 2017

knickly said:
Hello all,

One of my particular interests is the creation of precision parts without a precise like part. I've seen lots of information about the three plates method for making surface plates. What I've not seen much about is the creation of round parts.
How was this accomplished? Can an imperfect part be lapped to round? Would one measure in a vee-block, and progressively remove the high spots?

.
usually round part done on lathe with dead centers. if small error ok then live center is often good enough

AARONT · Dec 13, 2017

Are you asking how to make a round part outside of a lathe or a cylindrical grinder?

All parts are imperfect. Perfect, does not exist. There is only good enough for the job.

DMF_TomB · Dec 13, 2017

there are split laps that you can make smaller. like a split nut die. a split thread lap of fairly long length is a old methods to make screw threads more precise lead. drunken thread or variations in thread per inch become important with surveying optical and astronomy instruments.
.
when they make diffraction gratings of many fine lines on glass to break light up to colors for measure wavelength it is critical to have precise space

AlexO · Dec 13, 2017

knickly said:
Hello all,

Can an imperfect part be lapped to round? Would one measure in a vee-block, and progressively remove the high spots?

Yes.

And there is no need to "measure" anything unless a particular size needs to be hit. With care, rounds can be lapped to incredible roundness - 1/4 of half a micron is common for "kitchen" stuff.

MattiJ · Dec 13, 2017

Bit related: worlds roundest object Roundest objects in the world created | New Scientist

Richard King · Dec 14, 2017

On can talk about roundness, but having the correct equipment and instruments to measure it is the key. Professional Instruments / Air Bearings Inc. has a ton of info on roundness. I have taught a scraping class at this Minnesota USA based company.
Rolling-Element Bearings | Professional Instruments Company

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Development of original round surfaces

knickly

Plastic

DMF_TomB

Diamond

AARONT

Stainless

DMF_TomB

Diamond

AlexO

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MattiJ

Titanium

Richard King

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