Dore small boring bars

I think the "blunt" nature of an insert will always tend to push it off the surface more than a sharp HSS tool particularly if sneaking up to a finished size. Just changing to HSS in a solid bar would more than likely shown similar results.

Where bores are important eg engine cylinders I will rough out with insert tooling and then switch to HSS for the last 1/32" or so. Its easy to see that the HSS bar is flexing less as the tool rubs far less when withdrawn than the insert.

J

towards the bottom of the page is more info on tuneable/anti-vibration bars

**LINK**

Very interesting, Jimmy ... thanks

You may also like the patent that I've just added to my previous post.

MichaelG.

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Agreed, Jason

The reason I quoted that extract was that it includes reference to dimensions that people have been wondering about.

MichaelG.

They obviously did not watch the video I linked to

He suggests a 3.0mm drilled hole to give a loose sliding fit on the rod rather than reaming 3.0mm which is too tight on the 3.0mm silver steel rod, about 9mins into the video.

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But we're digressing a little from the Dore/Hemingway design that is the subject of this thread.

The Hemingway site is not specific about the dimensions of the long series drill that's supplied in the kit, and makes no reference to reaming, or to the 'fit' of the pushrod ...

http://www.hemingwaykits.com/acatalog/_Dore__Small_Boring_Tools.html

I was simply gathering information to inform our analysis.

MichaelG.

Related to this, I've seen anti-vibration boring bars with springs and weights inside. Sometimes vibration and be removed from a job by REDUCING the clamping, its all about altering the frequency of the vibration...

Related to the liquid filled anti-vibration boring bars, we had an apprentice chop on down once, when the magic liquid leaked out, he realised he'd made a bit of a mistake............