the Binford Clamp-O-Matic 5000

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

FritzW

Well-Known Member
Log Member
Joined
Jan 30, 2011
Messages
3,886
Location
Las Cruces, NM
Since my "clamp-less" Ranger project is taking every clamp I can find... :oops:
20190819_115828_resized.jpg


The 'clecoed wood' idea is working out great for aligning the parts but they're not supplying enough clamping pressure (some do, some don't, it's not reliable). So I came up with some quick and dirty clamps that take care of alignment and clamping pressure.

Ranger clamps6.JPG
Ranger clamps7.JPG
The grey lines show the stick and the plywood and the 1/8" offset that I need for the top and bottom skins. The top clamp is for stock that's pretty close to 3/4" square (+/- a few thousandths). The bottom one let's me get away with stock that's a little farther out than that. ...not that any of my stock is more than .002 out

The mustache clamp replaces the tin cans full of nuts and bolts in the top picture. It applies pressure over about 5 1/2", perfect for the typical 6" cleco spacing. The #6 Nylon bolt goes up through a cleco hole that's in the middle of the panel where edge clamps wont reach.

Ranger clamps4.JPG
Ranger clamps5.JPG
There's just enough bow in it to apply even pressure along the whole clamp when the wing nut pulls the center down to the wood.

Here's the general idea...
Ranger clamps1.JPG
Ranger clamps2.JPG
Ranger clamps3.JPG

A set of three (one of each) cost about 10 cents and takes about 30 minutes to print. Most of that is the mustache, but I'll only a half dozen of those.
20190819_184026_resized.jpg


...continued on next post because I hit the picture limit :mad:
 
Last edited:

FritzW

Well-Known Member
Log Member
Joined
Jan 30, 2011
Messages
3,886
Location
Las Cruces, NM
... post #1 continued

Here's the flex in the mustache that evens out the clamping pressure when the wing nut tightened (I didn't have any Nylon bolts or wing nuts, I'll have to order some from McMaster Carr)
20190819_185628_resized.jpg
20190819_185900_resized.jpg

A test fit...
20190819_185951_resized.jpg


I glued up some scrap with just the small clamps to make sure the pressure was right. Judging from the squeeze out I think I got lucky on the first try. ...there would be lots of way to change the clamping pressure
20190819_192749_resized.jpg
I'll give the glue a few days before I break it and see how it does.
 

Charles_says

Well-Known Member
HBA Supporter
Joined
May 26, 2019
Messages
137
AND.......
For the low tech set


1" x 2" x length you need furring strips with a bolt, "acoupla" washers, and a wingnut.Epoxying rear Spar.jpg (My pic)
the static end, can have extra blocks to adjust for thicker pieces. Make 'em for about a buck (USD) or so, ea.

and don't forget the wife's stash of mini clamps.....
aileron tip match-up.jpeg
i.e. clothes pins... available in the "Dollar Store" here in the US..
(photo, by others found on the net)
 

FritzW

Well-Known Member
Log Member
Joined
Jan 30, 2011
Messages
3,886
Location
Las Cruces, NM
Clamping pressure is only part of what these (orange) clamps do. Their real trick is holding the parts in proper alignment while they do the clamping. And the mustache clamp does it out in the middle of a panel where all these other clamps can't reach.
 
Top