Is it me?

I have a Bosch PEX400 which is a couple of years old. Disc attachment is by
loop and pile (Velcro type). In use, the thing works well for a few minutes
and then throws its disc off. It will then not re-attach reliably,
suggesting that the loop pile is no more. A new disc restores it to health
for another couple of minutes. Altering the rotation speed appears to have
no effect on when the disc becomes an UFO. Holes are carefully lined up each
time with the base. Deliberately obstructing the holes make no difference
though.

I consider this to be a fault as it happens regardless of disc brand,
including Bosch, so I bought a new sander last week. It was a B&Q own brand
Mac Allister, bought as a cheapy because my Bosch is in France. Spec is dual
base 150 and 125mm, variable speed random orbit.

This one shows exactly the same symptoms. Disc nowhere near worn and becomes
useless.

So is it me, or is this to be expected?



--
AJL Electronics (G6FGO) Ltd : Satellite and TV aerial systems
http://www.classicmicrocars.co.uk : http://www.ajlelectronics.co.uk

I have a black and decker multi sander (can't remember the exact model
off hand) with the same type of "velcro" attachment. I had the same
problem a couple of years back when it was brand new. The supplied
round discs vibrated loose and became UFOs within minutes. I got some
more from B&Q (don't remember the brand) and they behaved the same. I
couldn't believe I was doing anything wrong. B&Q grudgingly refunded
the discs. Since the sander works fine with the angled base for
detailing I held onto it & I used it loads for that.

On 15 May, 09:20, "Andy Luckman (AJL Electronics)"
wrote:

This one shows exactly the same symptoms. Disc nowhere near worn and becomes
useless.

Are the disks any good? If their pile is too short, or too
compressed, they won't grip on anything.

In article ,
Andy Luckman (AJL Electronics) wrote:
I have a Bosch PEX400 which is a couple of years old. Disc attachment is
by loop and pile (Velcro type). In use, the thing works well for a few
minutes and then throws its disc off. It will then not re-attach
reliably, suggesting that the loop pile is no more. A new disc restores
it to health for another couple of minutes. Altering the rotation speed
appears to have no effect on when the disc becomes an UFO. Holes are
carefully lined up each time with the base. Deliberately obstructing the
holes make no difference though.

Have you tried washing the pad on the machine? Dust etc can stop the loop
and hoop working properly. My similar Bosch is several years old and still
ok.

--
*Time flies like an arrow. Fruit flies like a banana.*

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
Andy Luckman (AJL Electronics) wrote:
I have a Bosch PEX400 which is a couple of years old. Disc attachment is
by loop and pile (Velcro type). In use, the thing works well for a few
minutes and then throws its disc off. It will then not re-attach
reliably, suggesting that the loop pile is no more. A new disc restores
it to health for another couple of minutes. Altering the rotation speed
appears to have no effect on when the disc becomes an UFO. Holes are
carefully lined up each time with the base. Deliberately obstructing the
holes make no difference though.

Have you tried washing the pad on the machine? Dust etc can stop the loop
and hoop working properly. My similar Bosch is several years old and still
ok.

--
*Time flies like an arrow. Fruit flies like a banana.*

Dave Plowman London SW
To e-mail, change noise into sound.


Also don't run the sander when the disc is not in contact with the work, and
watch when sanding the edges of your job.

I nearly lost an eye once when a disc went AWOL on my bosch sander, still
got the scars to prove it. LOL

On May 15, 8:20 pm, "Andy Luckman (AJL Electronics)"
wrote:
Is it me?

I have a Bosch PEX400 which is a couple of years old. Disc attachment is by
loop and pile (Velcro type). In use, the thing works well for a few minutes
and then throws its disc off. It will then not re-attach reliably,
suggesting that the loop pile is no more. A new disc restores it to health
for another couple of minutes.

I was able to buy a new (non-Bosch) Velcro pad for my Bosch that made
it work again. It was surprisingly cheap.

Andy Luckman (AJL Electronics) wrote:

Is it me?

I have a Bosch PEX400 which is a couple of years old. Disc attachment is by
loop and pile (Velcro type). In use, the thing works well for a few minutes
and then throws its disc off. It will then not re-attach reliably,
suggesting that the loop pile is no more. A new disc restores it to health
for another couple of minutes. Altering the rotation speed appears to have
no effect on when the disc becomes an UFO. Holes are carefully lined up each
time with the base. Deliberately obstructing the holes make no difference
though.

I consider this to be a fault as it happens regardless of disc brand,
including Bosch, so I bought a new sander last week. It was a B&Q own brand
Mac Allister, bought as a cheapy because my Bosch is in France. Spec is dual
base 150 and 125mm, variable speed random orbit.

This one shows exactly the same symptoms. Disc nowhere near worn and becomes
useless.

So is it me, or is this to be expected?



I had the same problem after a couple of years use and put it down to
wearing out the backing/velcro bit the disks attach to. Ordered a new
backing/velcro disk and the problem was fixed.

--
David in Normandy.

Andy Luckman (AJL Electronics) wrote:
Is it me?

I have a Bosch PEX400 which is a couple of years old. Disc attachment
is by loop and pile (Velcro type). In use, the thing works well for a
few minutes and then throws its disc off. It will then not re-attach
reliably, suggesting that the loop pile is no more. A new disc
restores it to health for another couple of minutes. Altering the
rotation speed appears to have no effect on when the disc becomes an
UFO. Holes are carefully lined up each time with the base.
Deliberately obstructing the holes make no difference though.

I consider this to be a fault as it happens regardless of disc brand,
including Bosch, so I bought a new sander last week. It was a B&Q own
brand Mac Allister, bought as a cheapy because my Bosch is in France.
Spec is dual base 150 and 125mm, variable speed random orbit.

This one shows exactly the same symptoms. Disc nowhere near worn and
becomes useless.

So is it me, or is this to be expected?

I've got the B&Q own brand RAS and its been a great toll, never had a disc
come off.

What I have noticed with my Bosch PMF 180 multi tool, when used in sanding
mode, is that sometimes part of the velco stuff from the sanding sheet stays
on the holder & then the sheets fall off. It seems like the grip of the
velcro is stronger that the adhesion between the velcro & the abrasive
sheet. Clean up with a stiff brush sorted it.

I think it was a combination of cheap discs & them being stored in slightly
damp conditions.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk