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Machine mods, oddities, and fix-ups #5: Panel saw flip stop system

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Blog entry by Loren posted 709 days ago 3361 reads 1 time favorited 6 comments Add to Favorites Watch
« Part 4: Record RPML 300C mini lathe Part 5 of Machine mods, oddities, and fix-ups series Part 6: Video - Euro style vertical shop made panel saw »

I made a bunch of these flip stops for my panel saw. I used 1/4” x 1/2” aluminum bar stock offcuts I bought on ebay from a surplus dealer for very cheap. The brass 1/4-20 thumb nuts were bought from an ebay seller as well. I bought some t-bolts from Woodline USA (like toilet bolts) but these brass thumb nuts don’t fit them (regular 1/4-20 nuts do), so I used regular 1/4-20 hex head bolts and they work well, though perhaps sliding in the t-track a little less smoothly.

The t-track was a cool find from Woodline USA because it has 2 tracks in one extrusion and it’s not expensive. This setup allows me to have “set-and-forget” flip stops set for common cuts on the upper track and 1 or 2 stops for regular movement on the lower track.

I had to design the stop system to be out of the way in less than 1.5” of depth with the stops flipping to stand proud of the plane the panel to be cut rests on. That plane is delineated by the white melamine support bars.

While such a stop system would not be as useful for crosscut fences on miter saws and table saws, it could be recessed into a working table for drilling applications and things like that…. and of course for a vertical panel saw it solves the problem of a stop system neatly.

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Making the stops is not difficult but does require some precision in drilling the parts due to their small size. If I started over I might get 5/16” or 3/8” by 1/2” aluminum bar because it would allow the drilling of parts to be a less precise and fussy process. As I did it you can see that the flip-stop is drilled very close to its corner (centered 1/10th inch in from the edge and end) and the profiled sliding part is drilled on its end 1/10” down from its top surface. I misdrilled a few parts as I was figuring the process out. Also the washers are the smallest I have on hand but ones with a smaller OD would be better and make the drilling a little more forgiving.

The end drilled part is tapped for a 6/32 machine screw. I used Loctite, and twist the screw in as hard as I can by hand. The aluminum quickly develops some slop in the fit so making it tight to start prevents floppy flip stops.

Profiling the bar sections to fit in the channel was done on my linotype saw-trimmer in sections about 5” long. The linotype saw has a clamp for holding small pieces of metal so it does this with precision and safety. Lacking such a saw, I would recommend cutting the profiled pieces with a straight bit buried in a straight wood fence on a router table and a work-holding jig with a couple of De-sta-co style clamps to hold the aluminum securely.

After the lengths are profiled I do a little filing and test the length in the track for a good fit. If the “tongue” doesn’t engage in the track, then the stop will twist when bumped and right-angle accuracy isn’t available.

The profiled section could be made in Delrin or maybe even wood. Wood doesn’t hold small tapped threads very well and is prone to splitting so I would recommend the plastic or metal. I didn’t look but you can probably find something plastic already made for t-track that would work if you don’t want to mess the router jig for profiling the part.

After the parts are profiled and fit it the track, I cut them to length (1-1/8” long), drill a center hole and then work the part some more with a file to get it smooth enough on all edges to slide well in the track.

This aluminum can be cross-cut on a table saw or miter saw, but you should make a jig to hold the parts since they are so short. It is important the ends be square for the flip stop to be accurate.

-- http://lawoodworking.com



6 comments so far

View Bertha's profile

Bertha

12951 posts in 1327 days


#1 posted 707 days ago

That is really slick, Loren!

-- My dad and I built a 65 chev pick up.I killed trannys in that thing for some reason-Hog

View Matt Przybylski's profile

Matt Przybylski

446 posts in 1011 days


#2 posted 506 days ago

Loren, this is very cool. Can you give a direct link to the woodline page for the track? I can’t seem to find it, hopefully they still produce it. Thanks.

-- Matt, Illinois, http://www.reintroducing.com

View Loren's profile (online now)

Loren

7441 posts in 2281 days


#3 posted 506 days ago

View Matt Przybylski's profile

Matt Przybylski

446 posts in 1011 days


#4 posted 506 days ago

Ok, I take that back, I did see that :) what are the dimensions of that thing and how long is it? I don’t see that info anywhere on the site.

Thanks for the link.

-- Matt, Illinois, http://www.reintroducing.com

View Loren's profile (online now)

Loren

7441 posts in 2281 days


#5 posted 506 days ago

48” long.

-- http://lawoodworking.com

View 559dustdesigns's profile

559dustdesigns

632 posts in 1801 days


#6 posted 506 days ago

Looks good man, thanks for sharing.

-- Aaron - central California "If you haven't got the time to do it right, when will you find the time to do it over?"

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