HI Dave. There are no mounting holes. I had to drill two. With two big bolts it's solid as a rock. There's a thumb screw on top to lock it up. I drilled a hole thru it and stuck a short piece of 1/4" rod in to lock it up more solidly. I ran into a problem of rigidity when trying to measure cpm's to better than a tenth. For non-anal work it's plenty solid. I use the 19/32 and 39/64 collets and they work for most shafts. On a tight fit I sometimes have to pull the shaft in through the rear end. FLOing works great, so does frequency measuring.
Cheers, John K ----- Original Message ----- From: Dave Tutelman <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, March 19, 2003 7:35 AM Subject: RE: ShopTalk: Straightness finder > At 07:43 AM 3/19/03 -0600, Royce Engler wrote: > >If you want to get real precise, here's another solution....get a Spin Index > >from Wholesale Tools (1709-0010) and a 5C collet to fit the shaft. Chuck > >the butt end and rotate the spin index, and you'll see the runout on the > >tip. Mount a dial indicator at the tip to actually measure it. The catalog > >says $49, but I paid about $30, plus $10 for the collet. You'll need > >different collets for steel and graphite shafts.... 0.6 inches isn't nearly > >as exact for shaft manufacturers as it is for machinists. > > Royce, > Thanks for the suggestion. A couple of questions: > > (1) How solid is it? I had the impression from a previous correspondence > that you were using an aerospace-surplus indexer that was VERY accurate and > solid. Are you actually using this commercial one? In particular: > - Is it solid and accurate enough that no wobble is seen with a > really straight shaft? (This will depend mostly on the "tightness" of the > bearings and the concentricity of all the cylinders and holes.) > - Is it rigid enough that it can be used to vibrate a shaft to > find FLO? > > (2) The picture on the web site does not show mounting holes in the base -- > or my eyes aren't good enough to see them. How does it mount? > > (3) Which collets did you need? I assume they were selected from among: > 1702-0170: 37/64 = .578 > 1702-0175: 19/32 = .594 > 1702-0172: 39/64 = .609 > > Thanks! > DaveT > > >
