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RE: Dremel Std runout?

bobbyrae — Fri, 03 Jul 2009 23:07:36 GMT

[quote][b]sandy (7/3/2009)[/b][hr]Can you educate me as to the terms "end play" and "run out"?

Thanks[/quote]

Sorry for presuming that these would be common terms that everyone was familiar with.

End play is the movement of the shaft that can be found by lateral pressure when the tool off. Some might call it "wiggle" or "slop".

The freedictionary says "movement endwise, or room for such movement."

Runout is the variation in position of a bit that you can measure when rotating the shaft. Normally you would use a dial gauge, but it can sometimes be seen with the naked eye. Another word for it might be "wobble". I have also heard people use the term "concentricity". The idea would be to compare the circle occupied by the bit when stopped to the circle made while it was rotating.

Here is a link to a woodworker forum that explains:

http://www.woodcentral.com/bparticles/DPMeasurements.shtml

Both terms, of course, relate to the unavoidable machining errors that result from manufacturing things in high volume.

RE: Dremel Std runout?

sandy — Fri, 03 Jul 2009 16:24:24 GMT

Can you educate me as to the terms "end play" and "run out"?

Thanks

Dremel Std runout?

bobbyrae — Thu, 02 Jul 2009 05:57:36 GMT

I've had my 395 for over 10 years and given if very light use. From the outset I found myself just assuming that it naturally had some end play and slight runout, and didn't really need it any better than that for what I was doing.

But then I ran across some guy on the internet saying how to cure the end play with some tape around the bearings and, WOW! It is so much smoother and quieter. Trouble is the shaft seems a little warped in that I have as much as .020" runout at the end of drywall bit.

My question for customer support: "Is that normal, or should I expect better?" The response was to just send it in for repair and see what happens. So I did and they haven't called yet. But in the meantime, I have been searching the internet and found people saying that .001" runout should be expected and was typical.

I am looking at drilling some holes around 1/32" (.75mm) and need some good precision. If the Dremel can't do that, I will have to keep looking around.