Mebfab
Diamond
- Joined
- Jun 7, 2003
- Location
- Mebane North Carolina USA
Starrett 494 for sale $40 delivered. 
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Starrett 494 FS
- Thread starter Mebfab
- Start date
- Replies 12
- Views 3,633
Monarchist
Diamond
- Joined
- Oct 2, 2012
- Location
- Sol, Terra
I'll wait on Steve's decision.
Otherwise, "deal". Whatever size they are, they are better than "none".
Mebfab
Diamond
- Joined
- Jun 7, 2003
- Location
- Mebane North Carolina USA
All 1/2" diameter
Monarchist
Diamond
- Joined
- Oct 2, 2012
- Location
- Sol, Terra
I'm good with that - unless Steve wants to exercise "dibs" on them.
No pressing need here, so I'm also good with that if he does do.
Bill
Monarchist
Diamond
- Joined
- Oct 2, 2012
- Location
- Sol, Terra
Monarchist
Diamond
- Joined
- Oct 2, 2012
- Location
- Sol, Terra
Received several days ago, thanks! Will do me just fine.
jhlowrider
Plastic
- Joined
- Apr 2, 2020
What are these buttons used for and how?
You drill and tap a hole in the appropriate location that an actual hole will be needed (typically a precise location to be reamed or bored).
Then you mount the button which is just a nicely machined cylinder with an oversized hole through the center to the work.
You use indicators and such to accurately locate the button(the over sized hole allows it to be moved around)(measuring off known other features), then use an indicator in the machine spindle to locate the center of the button, then remove the button and bore your actual hole.
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Then you mount the button which is just a nicely machined cylinder with an oversized hole through the center to the work.
You use indicators and such to accurately locate the button(the over sized hole allows it to be moved around)(measuring off known other features), then use an indicator in the machine spindle to locate the center of the button, then remove the button and bore your actual hole.
Sent from my iPhone using Tapatalk Pro
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Its what made possible precise devices over a hundred years ago
Think tooling for volume production of such as pocket watches
great read on how to
Accurate Tool Work - Clarence Leon Goodrich, Frank Arthur Stanley - Google Books
ph
Think tooling for volume production of such as pocket watches
great read on how to
Accurate Tool Work - Clarence Leon Goodrich, Frank Arthur Stanley - Google Books
ph
eKretz
Diamond; Mod Squad
- Joined
- Mar 27, 2005
- Location
- Northwest Indiana, USA
You can use gage blocks between features and buttons or between two buttons to position them also. Can also use adjustable parallels between or measure over two buttons with a mic. All sorts of ways to do it.
Normally the buttons would first be set up to a workpiece on a surface plate with height gage and positioning equipment, (angle plate, etc.) then taken to the machines and an indicator would be used to set the spindle centerline directly over the correct spot. Initial tapped holes to hold the buttons to a plate or workpiece can even be drilled and tapped by hand. Initial tapped hole placement does not need to be very precise at all thanks to the oversized holes in the buttons and the fact that they are really only used to clamp the buttons and get removed later anyway.
Like John mentioned, excellent for making very precise jigs and fixtures.
Normally the buttons would first be set up to a workpiece on a surface plate with height gage and positioning equipment, (angle plate, etc.) then taken to the machines and an indicator would be used to set the spindle centerline directly over the correct spot. Initial tapped holes to hold the buttons to a plate or workpiece can even be drilled and tapped by hand. Initial tapped hole placement does not need to be very precise at all thanks to the oversized holes in the buttons and the fact that they are really only used to clamp the buttons and get removed later anyway.
Like John mentioned, excellent for making very precise jigs and fixtures.
James H Clark
Stainless
- Joined
- May 11, 2011
- Location
- southern in.
Normally called tool maker buttons.
JH
JH
