Salsa Blackborow with Grin Max45

[MSF]

Kickstand clamp idea was a bust. For some reason i assumed it would be solid directly under clamp so my plans to notch it out for the torque arm didn't work out. Came up with a bit ugly temporary solution that I'm sure will be far stronger than before.

 

[99t4]

Clamped along two different axes logically seems helpful but the upper clamp looks like it could allow slippage along the arc that the TA extension would want to travel. Plus, while rubber gasketing is appealing to help keep from marring the frame, it could allow small movement, which we don't want any of at the TA. Some things to think about...

I'm wondering if it is possible to flip the TA arm over so that its original foot would be pressing down on the top surface of the chainstay, which is what the regen force on the TA arm would be doing. That way the clamps would just be holding it in place, not also trying to keep it from pulling apart from the chainstay (except under forward power, which seems like less of a force than your regen? Maybe I'm wrong?)

 

[MSF]

Still have some fine tuning to finish up tomorrow. Notched it out to lock in onto the brake caliper bracket ground and filed the inside a bunch because the tubing is oval and tapered. With bolts finger tight there was no movement in any direction.

 

[chuyskywalker]

Now you can snap the frame instead! ;D

 

[neptronix]

To me this looks like a very strong part of the frame to be pushing and pulling on.
I'd rate the chance of success as higher than average.

Too bad you can't easily clamp directly to those monster disc brake tabs, but this looks like the second best option.

 

[chuyskywalker]

On a less jokey note, there is mention on the motor page about "DIY" option torque arms that you could inquire about.



Though that one looks like an old gen and I can't find anything listed -- but "torque arm for 150A applications" isn't something grin would really have listed.

 

[maiz]

On a less jokey note, there is mention on the motor page about "DIY" option torque arms that you could inquire about.

View attachment 376731

Though that one looks like an old gen and I can't find anything listed -- but "torque arm for 150A applications" isn't something grin would really have listed.

They need a skunkworks

 

[MSF]

Now you can snap the frame instead! ;D

I knew that was coming

 

[MSF]

This next project should keep the motor happy.

I ran a test with it the other day before i started the case build

 

[neptronix]

How's the starting torque on that, quite weak?

 

[MSF]

How's the starting torque on that, quite weak?

Yes a bit weak but i guess whatever it takes to make this last.

 

[lnanek]

On a less jokey note, there is mention on the motor page about "DIY" option torque arms that you could inquire about.

View attachment 376731

Though that one looks like an old gen and I can't find anything listed -- but "torque arm for 150A applications" isn't something grin would really have listed.

That does look a lot stronger. I guess the weak standard slotted torque arm was an attempt to reduce weight and make rear wheel removal easier for fixing flats.

Doesn't have much lever length, but I suppose it will often just be bolted to a motorcycle style swing arm anyway.

 

[MSF]

This would have been a nice area to mount to

 

[MSF]

 

[MSF]

Gotta love these waterproof connectors

 

[MSF]

Went for good ride today with the bac855 controller. I successfully made the torque arm splines far worse and to the point of driving me nuts. Before the only slop was between the spacer and TA now i have play between the axle and spacer as well. With the pressure from the hold down bolts it makes all sorts of creaking noises and a good clank when hitting the regen. Only option now is to epoxy them together
.

 

[chuyskywalker]

Only option now is to epoxy them together

Is the idea that the epoxy would fill the gaps and prevent the slop-rotation you're experiencing? Can epoxy...handle that?

 

[MSF]

Is the idea that the epoxy would fill the gaps and prevent the slop-rotation you're experiencing? Can epoxy...handle that?

That is the idea but most likely it will break down. I have some jb weld steel reinforced epoxy that i will try tomorrow.

 

[chuyskywalker]

That is the idea but most likely it will break down. I have some jb weld steel reinforced epoxy that i will try tomorrow.

Can't hurt to try, I suppose, but...yeah -- hard to imagine something liquid will turn solid enough to be better than the metal used to be. Gonna take all weekend to cure probably, too.

 

[MSF]

Can't hurt to try, I suppose, but...yeah -- hard to imagine something liquid will turn solid enough to be better than the metal used to be. Gonna take all weekend to cure probably, too.

Says 6hr cure time. Its done now so I can test in the morning.

 

[MSF]

I didn't like the idea of this one bit but not sure what else to try at this point.

 

[amberwolf]

Is the idea that the epoxy would fill the gaps and prevent the slop-rotation you're experiencing? Can epoxy...handle that?

Well, it would be better than the air that's not handling it now.

I don't know how hard DP420 is but that's what some people ahve used to glue torque plates to their frames successfully.

 

[neptronix]

Maybe you could get grin to send you a new side cover. and torque arm.
They do manufacture both parts after all.

 

[MSF]

Maybe you could get grin to send you a new side cover. and torque arm.
They do manufacture both parts after all.

I'm sure i could but being aluminum wont it just wear out again? Either way we will see how the epoxy goes. If it fails i will reach out to grin for some ideas.

 

[MSF]

Well, it would be better than the air that's not handling it now.

I don't know how hard DP420 is but that's what some people ahve used to glue torque plates to their frames successfully.