Drive dog frustration

[RIPFENCE]

I CANNOT KEEP MY OCTURA 3/16 DRIVE DOG TIGHT...THE LAST FIVE ATTEMPTS AT RUNNING MY CYBERSTORM GETS TO 35 MPH AND BREAKS LOOSE.....SHOULD I CUT A FLAT OUT OF MY FLEX SHAFT OR ARE THERE BETTER SOLUTIONS...I AM RUNNING AN NEU 1521 1Y AND M645 PROP ON 5S AND 6S LIPO..

[Doug Smock]

Yes you need a flat on the shaft or it will continue to give you problems. A drop of blue Locktite won't hurt either.
Doug

[Ub Hauled]

I put a flat spot on the stub and tighten the dog good... on top of that, so it does not shift place when I put the prop on, I put some "blue" loctite on the thread where the prop nut will go so I don't have to squish the drive dog... like Doug said, "blue glue" under the drive dog will not hurt.

[RIPFENCE]

Ok thanks guys..i had the blue loctite but no flat..tomorrow will be a better day

[andym]

I silver solder (45%) all my drive dogs now. Got sick of rounding out grub screws, moving drive dogs etc.

[RIPFENCE]

andym,
do you just put the solder in the grub screw hole? or around the drive dog somehow

[Jeepers]

I use Loctite 603 to hold my drive dogs in place.

[ozzie-crawl]

I silver solder (45%) all my drive dogs now. Got sick of rounding out grub screws, moving drive dogs etc.

they imperial threads suck,i think some of the ones andrewg was selling were metric much finer thread,i brought a box of 3mm stainless steel grub screws
haven't had trouble since

[andym]

I locate the dog so as both short hub (1743 etc) and long hub ( m645, m447 etc) can be used and tighten grub, then put in vice to hold. Then with the No6 oxy tip and 45% silver solder ( 1mm ) proceed to apply a tiny amount from the front side ( Flat) of dog. Works a treat. Only use enough heat to flow the solder and use only a little silver

[Doug Smock]

Just about 1300 degrees!

[FloatDaBoat]

I like the set screws that are supplied with Octura Drive Dogs, as the Allen Wrench hole goes all the way through the set screw - - less 'chance' of it rounding-out.

I've tried to find that type set screw on the web, with no luck. Anyone know of a source???

[Simon.O.]

By now we are close to flogging a deceased equine....
I grind a very small flat for the set screw to seat on and ensure that the bottom of the set screw is flat too.
A little bit of work during the assembly of a shaft setup means I have no headaches from them at the pond.

[andym]

Just about 1300 degrees!

Actually 680 Deg C- 1256 deg F, this is well below the temp for chromium to move( approx 1300 deg C) and therefore SS safe temps no stabilization required. It imparts NO problems on shafts if done correctly! Doug I will listen to you on boat set up but as a specialist welder for nearly 30 years I will win this one. 300 Series will not heat harden and under most conditions will not rust or go magnetic 400 series however is a different story

[Doug Smock]

Actually 680 Deg C- 1256 deg F, this is well below the temp for chromium to move( approx 1300 deg C) and therefore SS safe temps no stabilization required. It imparts NO problems on shafts if done correctly! Doug I will listen to you on boat set up but as a specialist welder for nearly 30 years I will win this one. 300 Series will not heat harden and under most conditions will not rust or go magnetic 400 series however is a different story

No argument, been using 45% silver for over 25 years in the commercial refrigeration business myself.
I think you MAY agree that the average hobbyist isn't going pull this off without the proper equipment and a slight learning curve.

Have a great day fellas.
Good luck Aaron,
Doug

[FloatDaBoat]

I did a quick research on this, also. I found a warning about using MAPP Gas as a heat source, as it's chemical properties can cause carbonization, which leads to brittleness. I ain't got a clue if that applies to Stainless Steel, though. Good to have a wide spectrum of expertise contributing to the threads here on OSE !!!