On Tue, 16 Feb 2021 18:00:09 -0800 (PST), DerbyDad03
wrote:

On Tuesday, February 16, 2021 at 8:45:17 PM UTC-5, wrote:
On Tue, 16 Feb 2021 09:29:30 -0800 (PST), DerbyDad03
wrote:

On Tuesday, February 16, 2021 at 11:58:59 AM UTC-5, wrote:
On Tue, 16 Feb 2021 16:32:14 GMT, (Scott Lurndal)
wrote:
Leon lcb11211@swbelldotnet writes:
On 2/13/2021 2:03 PM, wrote:
On Sat, 13 Feb 2021 06:22:10 -0800 (PST), DerbyDad03
wrote:

I was at Woodcraft today, somehow the mind drifted to this discussion
while browsing in the toy store. Incra makes 18" and 24" zero-play
miter bars for about $20-$25. These should be long enough.

Maybe not! I have an Incra 1000HD miter gauge with the adjustable bar,
18" IIRC. If the miter gauge part is not over the TS top, it wobbles
back and forth. There are only 6 contact points/expansion disks along
the bar to insure the proper fit. The paired left and right expansion
disks are on each end and a pair are near the pivot point of the miter
gauge. So if the fence is not over the TS top there is only 1 pair of
expansion disks on the far end. With this length bar the fence has to
be over the TS top for any accuracy.

The longer bar that comes with the Incra sled has 10 pair and may work
better but $40.. Incra's web site price.

Youse guys are all woodworkers. How about ripping a 3' strip of oak or maple
to 3/4" x 3/4" and using that to align the infeed table with the mitre
slot?
That's really a side issue, IMO. I don't think the accurate extension
slot is needed at all, only support.

I too am curious as to why you say that. I have experienced the same thing
that Leon is describing. As more and more of my miter gauge bar is pulled
out of the TS slot, the more it wobbles from side to side.

If you're pulling the bar out that far, you're using the wrong tool.

That why I *don't* pull the bar out that far. I'm describing a test, not
a normal use.

If you don't use it, isn't it a little silly to test it that way?

However, a properly sized slot on a in-feed table would *allow* me to
to pull the bar out that far. A wide slot would not be any better than no
slot from a wobble perspective.

That's the whole point of what Leon and I are saying.

I understand what you're saying. I just don't think it's worth it
hanging up on any edge or any misalignment. ...more problem that it's
worth. Since you wouldn't use it that way either...

Leon described the same problem in his defense of a properly sized
slot. He said: "If the miter gauge part is not over the TS top, it wobbles
back and forth."

I got that.

The whole point of the properly sized slot is to allow for the use of miter
gauge on the in-feed table and have it be parallel to the blade (no wobble) even
when it is pulled partly out of the main TS slot. That's what would allow for wider
boards to be cut using the miter gauge as a guide.

The infeed table supports the board and the miter gauge, the properly sized slot
keeps the bar parallel with the blade.

I got all that. I just think it's more problem than it's worth.