Checking my tolerance before beginning a new project. Measures 006 difference between the front end and the back end. This is too much correct? I think it should be @ .003?
Thanks.
Brian
Checking my tolerance before beginning a new project. Measures 006 difference between the front end and the back end. This is too much correct? I think it should be @ .003?
Thanks.
Brian
Brian
Are you marking a spot on the blade with a marker and rotating the blade so that you're measuring at the same spot? If so, then yes, 0.006" is high, but it will certainly cut and may even give acceptable results.
I was just moving the measuring device in the slot from front to back. Got it down to .001. Should be OK. thanks brian
Brian
Well done. .001" is my target. Mostly I hit it, on some tools I stop when I get within reason if they are erratic while aligning.
"A hen is only an egg's way of making another egg".
– Samuel Butler
Unclear if you are measuring the same spot on the blade or randomly measuring along a line on the blade.
Bill D.
I have a digital gauge that mounts on a slider that fits in the miter slot. I raise the blade as high as it will go and measure the front of the blade and then slide the point of the digital gauge to the back of the blade and measure there. Probably not a true 180 degrees, but I think close enough for the girls I know! thanks brian
Brian
0.001" is closer than any other tolerance on a table saw. Plenty good. Even 0.006" isn't that far off. Heck, on my old 1968 Unisaw, the miter slots were worn more than 0.006" in the center, probably closer to 0.150" and the top had a dip in it close to 1/16". Setting that up was a matter of averaging things out. Even good old 'arn wears down over time
Remember for many decades, most people set their blade parallelness with nothing more than a combination square, and typically a Craftsman. Affordable dial indicators are something that only started when cheap machine tools became available from Taiwan in the late 80s/early 90s.
Last edited by Andrew Seemann; 11-13-2021 at 1:03 PM.
It does not really matter what one might think of the condition of his blade.
Best practice is to use the same point on the blade when taking both measurements. This eliminates the unknown...that being how much out of wack the blade may be...or not be.
Not doing this gives results that are questionable and not easily defended. Your results could be right on, or in error. Better just to eliminate the question, and use the same point on the blade for both measurements.
Too much to do...Not enough time...life is too short!
I bought a 1/8" X 10" disk that I use for this. Don't remember where I got it, but it makes checking the table alignment a piece of cake. It's basically a saw blade blank without the teeth. I built a Tee out of red oak that I mount a dial indicator to that slides in the miter slot.
But then are you confounding the out of flat on the blade with the runout on the arbor? What about the parellelness of the blade raising arm, do you need to average it top and bottom? What about the other miter slot, is it within 0.001" of the other slot? Are all the parts the same temperature? If you move the saw, do you average the measurements in the two places you use the saw the most?
This is all in jest of course, but you do hit a point of diminishing returns when setting things up, and at some point you begin chasing the tolerance of the individual components, not to mention their interaction with each other.
I found Steven Woodward’s video very helpful for checking and aligning the table top and fence.
https://youtu.be/tOHy69VmNwk