Backplate bend revisited

[The Kraken]

Hey K, could you elaborate on why you chose ~20 degrees of bend for your doubles plate? I assume it's not just for liftbag storage space...

. . . because it's pretty close to the angle on the plate from which I pirated my design when I started making b/p's !!!

the K

 

[ams511]

I have what I think is a prototype Abyss plate. The first bend is marked 26 degrees while the second is 18 degrees. The plate measures 15.75 inches high. Is this the usual size for a backplate? There is no size marking.

 

[*Floater*]

I have what I think is a prototype Abyss plate. The first bend is marked 26 degrees while the second is 18 degrees. The plate measures 15.75 inches high. Is this the usual size for a backplate? There is no size marking.

My medium DSS plate is 15" high. The bottom is roughly 10.5" wide (max) and the top is more like 8.5".

So your plate is 18 degrees where mine is marked 13 degrees in the pic?

 

[redacted]

I built my single tank 1/4 inch aluminum plate with no channel so I only had to make 2 bends of about 8 degrees each so my comparable angle is about 16 degrees. The STA that I built with it to hold a diverite travel wing adds another 5/16ths of an inch to the tank standoff. The rig is very stable. I don't use a crouch strap. I store a lift bag and a snorkle between the wing and the plate, one on each side of the tank. I don't believe the design would be suitable for doubles.

 

[ams511]

My medium DSS plate is 15" high. The bottom is roughly 10.5" wide (max) and the top is more like 8.5".

So your plate is 18 degrees where mine is marked 13 degrees in the pic?

Yes, your 13 degrees is my 18 degrees. The top of the plate is 9" under the top curve, the bottom is roughly 10" above the bottom curve. If you want I can take a pic. From reading Tobin's posts the DSS plate is a more flat design to hold the tank closer to the diver. There was a company called Jet Harnesses that made a totally flat plate for people diving only single tanks.

 

[*Floater*]

Old thread, but I'd still like a little more info, in particular, how bent are Dive-Rite and Hammerhead plates where mine is 13 degrees?

 

[cool_hardware52]

Old thread, but I'd still like a little more info, in particular, how bent are Dive-Rite and Hammerhead plates where mine is 13 degrees?

Check your protractor, DSS plates are 14 degrees

DSS plates are bent using a dedicated "one shot" bending die that forms all the bends in a single hit. This assures consistent results. We need this consistency to be able to do the molding of the slot grommets.

Keep in mind that most back plates are bent on a press brake, requiring 4 separate bends. Nothing wrong with BTW, but because both the location of the bend, i.e. where on the work piece, and the angle of the bend, is a function of accurately the press brake was set up each time you can expect some variation from production run to production run.

I've measured plates with up to 28 degrees of bend, and find most are around 20-22 degrees.

Tobin