On 3/19/2017 9:53 AM, J. Clarke wrote:
In article 0LmdnVRyEOR0DFPFnZ2dnUU7-
, lcb11211@swbelldotnet
says...

On 3/19/2017 8:50 AM, Leon wrote:
On 3/19/2017 3:16 AM, wrote:
On Saturday, March 18, 2017 at 3:52:48 PM UTC-5, J. Clarke wrote:

And yes, it is a problem. Circular saws turn in one direction, the
one in which (if the saw is well designed) the friction tightens
the bolt. The Fein oscillates, one direction tightens the bolt, the
other loosens it. After a while no matter how much you tighten it,
it comes loose. Doesn't help that it's tightened with a little
dinky Allen wrench.

Never knew that the early Feins had nothing more than a friction fit.
Truly, that doesn't make any sense, and I can't figure out how the
tool would ever work for more than the lightest applications. I
expect my multi tools to be able to cut everything on the job without
the blade coming loose, and even the cheap HFs do that just fine.
They have crudely cut lugs (8) that hold the blades using a hardened,
cupped washer held in place by a hex head screw.

Knowing that Fein was (is?) the undisputed king of oscillators, I
have to shake my head with wonder that all the heralded German
engineering couldn't solve the problem of slick blade retainage
surfaces /before/ the tool was first released decades ago. Surely
that had to be an issue they realized in testing.

I guess with nothing to compare it to, it was just accepted that
blade slippage was the way the tool operated.

Robert


I think I have had mine slip ONE time and it simply was not tightened
enough.
The fact that the blade oscillates probably cancels the tendency to
loosen, it tightens as much as it loosens.
I recall talking to a factory rep about the new lug design that was to
come out shortly. I wanted to know if I was going to want to wait. He
of course said no, but he said that I would not be losing any advantage.

I think that if slippage had been a concern that the competition would
not have come on so strongly when the patent for the non-lug model ran out.

Just another thought on this. If your patent runs out you need to
"improve" the design so that you will have an advantage over the soon to
come competition. Had slippage been a serious problem I think they
would have addressed it some where in the 20 years before the patent ran
out.
It is not unusual for a manufacturer to give in to a perceived need that
the customer wants, more of a marketing thing.

IIRC the time my blade loosened was when I had the blade turned a little
left of the direct line of push, naturally the blade wanted to turn the
attachment bolt in the loosening direction.

But with simply pushing the tool in line with the direction that the
blade is pointed, I have not has a loosening issue since.

Also, and this may be the trick too, the rep that I spoke to indicated
to not simply push the blade and tool straight into the work. He
indicated to also use a slight back and forth motion to help clear the
teeth. I did find that the tool cuts faster when using that motion.

You're either very lucky or have the muscles of
a gorilla if you've never had the blade on a
first generation Fein pop loose in the middle of
a cut.


I tighten enough that the tool, if it stopped in the left extreme of
travel, upside down, will turn to the right extreme direction when
tightening. And as I stated earlier pushing in line with the length of
the cutting attachment is very helpful. If the tool is right side up
and the blade is pointed right of center and you push in line with tool,
not the blade, the blade can loosen. In that case you need to push with
you hand on the head directly behind and in line with the cutter. And
as I mentioned before, a talk with the rep ironed out several issues.