I've got a Jet 10-20 drum sander. I've had it and used it for several
years. Today I used it for the first time since we moved and discovered
a strange problem.
I was thicknessing some maple boards by taking them down to 1/16"
oversize on my planer and then taking off the rest with a few passes
through the drum sander. Something I've done many times with no problems.
The boards are 4/4, about 6' long and 4"-8" wide. I set up infeed and
outfeed stands, each about 3' from the drum. The sander was set to take
off about 1/64".
What I get is a board that is, for example, 49/64" about one foot in,
50/64" two feet in, and 51/64" three feet in. Then it starts getting
thinner again until the other end. It's like the drum is gradually going
up and then back down.
I've tried running either face up and either end in first. Seems to make
no difference. I'm stumped. Help!
I'll call Jet tomorrow, but I thought I'd see if anyone here had a
solution. Probably more expertise here than at Jet :-).
--
Where have all the flowers gone? Pete Seeger 1919-2014
On Mon, 24 Feb 2014 00:12:30 +0000 (UTC), Larry Blanchard
<[email protected]> wrote:
>I've got a Jet 10-20 drum sander. I've had it and used it for several
>years. Today I used it for the first time since we moved and discovered
>a strange problem.
>
>I was thicknessing some maple boards by taking them down to 1/16"
>oversize on my planer and then taking off the rest with a few passes
>through the drum sander. Something I've done many times with no problems.
>
>The boards are 4/4, about 6' long and 4"-8" wide. I set up infeed and
>outfeed stands, each about 3' from the drum. The sander was set to take
>off about 1/64".
>
>What I get is a board that is, for example, 49/64" about one foot in,
>50/64" two feet in, and 51/64" three feet in. Then it starts getting
>thinner again until the other end. It's like the drum is gradually going
>up and then back down.
>
>I've tried running either face up and either end in first. Seems to make
>no difference. I'm stumped. Help!
>
>I'll call Jet tomorrow, but I thought I'd see if anyone here had a
>solution. Probably more expertise here than at Jet :-).
Are you properly supporting the board both going into the sander and
out? If the board is bowing, I can easily imagine this sort of
problem.
"Larry Blanchard" <[email protected]> wrote in message
news:[email protected]
> I've got a Jet 10-20 drum sander. I've had it and used
> it for several years. Today I used it for the first time
> since we moved and discovered a strange problem.
>
> I was thicknessing some maple boards by taking them down
> to 1/16" oversize on my planer and then taking off the
> rest with a few passes through the drum sander.
> Something I've done many times with no problems.
>
> The boards are 4/4, about 6' long and 4"-8" wide. I set
> up infeed and outfeed stands, each about 3' from the
> drum. The sander was set to take off about 1/64".
>
> What I get is a board that is, for example, 49/64" about
> one foot in, 50/64" two feet in, and 51/64" three feet
> in. Then it starts getting thinner again until the other
> end. It's like the drum is gradually going up and then
> back down.
>
> I've tried running either face up and either end in
> first. Seems to make no difference. I'm stumped. Help!
>
> I'll call Jet tomorrow, but I thought I'd see if anyone
> here had a solution. Probably more expertise here than
> at Jet :-).
The drum isn't going up and down, your boards are because your
infeed/outfeed stands are off by about 1/32. Too low.
When the board is going in the leading edge is slightly up and the hold down
is not strong enough to overcome the weight of the board to push it down
level, opposite at the outfeed side. After the board is partially through
the hold down can get it level until considerable is hanging out.
To fix, get the supports correct and/or adjust the pressure of the hold down
rollers.
--
dadiOH
____________________________
Winters getting colder? Tired of the rat race?
Taxes out of hand? Maybe just ready for a change?
Check it out... http://www.floridaloghouse.net
On Mon, 24 Feb 2014 08:48:38 -0500, dadiOH wrote:
> The drum isn't going up and down, your boards are because your
> infeed/outfeed stands are off by about 1/32. Too low.
>
> When the board is going in the leading edge is slightly up and the hold
> down is not strong enough to overcome the weight of the board to push it
> down level, opposite at the outfeed side. After the board is partially
> through the hold down can get it level until considerable is hanging
> out.
>
> To fix, get the supports correct and/or adjust the pressure of the hold
> down rollers.
I thought I'd been pretty careful setting up the supports, but I'll check
again. Maybe try setting them a hair high. I was a little suspicious of
the hold down pressure, but it'd always been sufficient in the past.
Plus it's hard to get to them to adjust them, but I may have to do that.
Thanks to you and the others who replied.
--
Where have all the flowers gone? Pete Seeger 1919-2014
Larry Blanchard wrote:
> On Mon, 24 Feb 2014 08:48:38 -0500, dadiOH wrote:
>
>> The drum isn't going up and down, your boards are because your
>> infeed/outfeed stands are off by about 1/32. Too low.
>>
>> When the board is going in the leading edge is slightly up and the
>> hold down is not strong enough to overcome the weight of the board
>> to push it down level, opposite at the outfeed side. After the
>> board is partially through the hold down can get it level until
>> considerable is hanging out.
>>
>> To fix, get the supports correct and/or adjust the pressure of the
>> hold down rollers.
>
> I thought I'd been pretty careful setting up the supports, but I'll
> check again. Maybe try setting them a hair high. I was a little
> suspicious of the hold down pressure, but it'd always been sufficient
> in the past. Plus it's hard to get to them to adjust them, but I may
> have to do that.
>
> Thanks to you and the others who replied.
Well damned Larry! You clearly should have known this. Off to the corner
with you. Fergodssake, we got important stuff to talk about here - not this
kinda stuff. Fix yer damned floor and report back how well it works now...
Sheese...
--
-Mike-
[email protected]
"Larry Blanchard" <[email protected]> wrote in message
news:[email protected]
> On Mon, 24 Feb 2014 08:48:38 -0500, dadiOH wrote:
>
> > The drum isn't going up and down, your boards are
> > because your infeed/outfeed stands are off by about
> > 1/32. Too low.
> >
> > When the board is going in the leading edge is slightly
> > up and the hold down is not strong enough to overcome
> > the weight of the board to push it down level, opposite
> > at the outfeed side. After the board is partially
> > through the hold down can get it level until
> > considerable is hanging out.
> >
> > To fix, get the supports correct and/or adjust the
> > pressure of the hold down rollers.
>
> I thought I'd been pretty careful setting up the
> supports, but I'll check again. Maybe try setting them a
> hair high. I was a little suspicious of the hold down
> pressure, but it'd always been sufficient in the past.
> Plus it's hard to get to them to adjust them, but I may
> have to do that.
BTW, the same thing will happen if the board is a bit bowed.
The in/out feed I use on my Performax 16 is made with 2.5" PVC pipe as
rollers. They are fastened in a frame which is hinged at the sides of the
sander cabinet so that they drop down when I don't need them. Both sides
are made in two sections enabling them to be extended to about five feet.
The outboard ends are supported by a single leg which is adjustable in
height via a sliding dovetail.
I mention this because I often sand long boards that have a bit of bow in
them. Since the leg is adjustable I can easily adjust the height to
accomodate the bow.
--
dadiOH
____________________________
Winters getting colder? Tired of the rat race?
Taxes out of hand? Maybe just ready for a change?
Check it out... http://www.floridaloghouse.net
"Larry Blanchard" wrote in message news:[email protected]...
>I've got a Jet 10-20 drum sander. I've had it and used it for several
>years. Today I used it for the first time since we moved and discovered
>a strange problem.
>I was thicknessing some maple boards by taking them down to 1/16"
>oversize on my planer and then taking off the rest with a few passes
>through the drum sander. Something I've done many times with no problems.
>The boards are 4/4, about 6' long and 4"-8" wide. I set up infeed and
>out feed stands, each about 3' from the drum. The sander was set to take
>off about 1/64".
>What I get is a board that is, for example, 49/64" about one foot in,
>50/64" two feet in, and 51/64" three feet in. Then it starts getting
>thinner again until the other end. It's like the drum is gradually going
>up and then back down.
This strikes me as an in-feed/out-feed support height issue... which could
be due to an uneven floor. That is, though the stands may measure the
correct height from floor to their top, the floor itself may not be level
and in the same plane from stand to sander to stand. Using a 4' level
between the sander table and the top of the in-feed/out- feed supports may
provide a good clue as to whether this is the problem.
John