pic: ABS-114, supercompact planetary PTO shifter

[aldaeron]

Originally Posted by asid61

I forgot to update the Partner Space recently it looks like. I just finished, so you can take a look at the CAD here.

I downloaded the ABS 114 folder and it is missing the majority of the SolidWorks files and has no STEP file. Can you do a Pack and Go and flatten?

[asid61]

Originally Posted by aldaeron

I downloaded the ABS 114 folder and it is missing the majority of the SolidWorks files and has no STEP file. Can you do a Pack and Go and flatten?

Sure, I'll stick that in the folder as well. I think you can download them all from GrabCAD that way but I'm not sure.
EDIT: It's up. Download "ABS-114.zip" in the ABS-114 folder on GrabCAD.

[aldaeron]

Very cool design!

What material are the planetary gears? 4000 series steel or 7075 aluminum Would you make your own hob to make these (they don't appear to be COTS)?

Still a super cool design

[asid61]

Originally Posted by aldaeron

Very cool design!

What material are the planetary gears? 4000 series steel or 7075 aluminum Would you make your own hob to make these (they don't appear to be COTS)?

Still a super cool design

The ring gear is a modified SDP-SI S1E10ZM10S072. I tried to avoid making custom gears, and will continue to do so until I can make my own gearcutting machine.

[Aren Siekmeier]

Took me a bit to figure out how the carrier plate ever gets unlocked, that is neat Just don't apply power while actuating the PTO cylinder!

It's hard to imagine you're using the CIM encoder to line up the locking notches with the cylinder. Can the rounded end of the locking pin ride up the outer contour to get into the notch? Why not make the locking notch the only groove, so the locking pin rides the OD until it engages? Like the locking plate on 118's arm in 2014: http://s22.postimg.org/3sk056lxt/Scr...3_19_25_33.png

Also, for the locking pins, I wonder if you could use something like mcmaster 84835A22 to reduce friction if you want to actuate the PTO cylinder and slide it in into place. You'd have to turn the gearbox slowly to avoid wrecking the lock after PTO engage and before drive disengage.

[asid61]

Originally Posted by Aren Siekmeier

Took me a bit to figure out how the carrier plate ever gets unlocked, that is neat Just don't apply power while actuating the PTO cylinder!

It's hard to imagine you're using the CIM encoder to line up the locking notches with the cylinder. Can the rounded end of the locking pin ride up the outer contour to get into the notch? Why not make the locking notch the only groove, so the locking pin rides the OD until it engages? Like the locking plate on 118's arm in 2014: http://s22.postimg.org/3sk056lxt/Scr...3_19_25_33.png

Also, for the locking pins, I wonder if you could use something like mcmaster 84835A22 to reduce friction if you want to actuate the PTO cylinder and slide it in into place. You'd have to turn the gearbox slowly to avoid wrecking the lock after PTO engage and before drive disengage.

I was never really sure how to align it myself, actually. If I try to make the pin ride up on the outer part like a cam, it adds a bunch of weight. I can definitely make some amount of taper though to fix that.
Currently you basically just depend on the encoder.

[Aren Siekmeier]

Originally Posted by asid61

Currently you basically just depend on the encoder.

I'd predict this to be fraught with problems, since the CIM shaft position is not necessarily linked to the position of the carrier plate or of the ring gear. You'd have to track both of these somehow in code based on how many counts you've accumulated in each of the PTO cylinder and shift cylinder states. And then you don't know what counts you're missing when either cylinder is actuating. But maybe that's not an issue if you never actuate the PTO cylinder until the end, and you can keep track of things well enough.

Seems it'd be more reliable if you can put an encoder on the carrier plate/ring gear themselves (a wheel side encoder might be all you need, if zeroed properly), or just have them automatically engage from any position.

[asid61]

Originally Posted by Aren Siekmeier

I'd predict this to be fraught with problems, since the CIM shaft position is not necessarily linked to the position of the carrier plate or of the ring gear. You'd have to track both of these somehow in code based on how many counts you've accumulated in each of the PTO cylinder and shift cylinder states. And then you don't know what counts you're missing when either cylinder is actuating. But maybe that's not an issue if you never actuate the PTO cylinder until the end, and you can keep track of things well enough.

Seems it'd be more reliable if you can put an encoder on the carrier plate/ring gear themselves (a wheel side encoder might be all you need, if zeroed properly), or just have them automatically engage from any position.

Ideally a hall effect sensor + magnet on the ring and on the carrier would work.

[Colin Small]

Wow! Amazing work! Just curious, what do you do to make pocketing/support structure between mounting/bearing holes in CAD? Do you offset entities on the holes and then connect the expanded material through lines?

[asid61]

Originally Posted by Colin Small

Wow! Amazing work! Just curious, what do you do to make pocketing/support structure between mounting/bearing holes in CAD? Do you offset entities on the holes and then connect the expanded material through lines?

Thank you!
To do pockets, that's basically what I do. After offsetting entities, I connect the centers of some holes with centerlines then offset them to get the inside trusses. The outside contour is made by placing lines tangent to the circles around the edge with the endpoints of the line coincident to the circles. Offset them in one direction and do an extrude-cut and select the areas to remove.
Makes a really nice shape, although sometimes you end up with corners to small to fillet normally. Then you have to use face fillets one at a time.

[Oblarg]

Nice touch with the socket output. I did this on one of my gearboxes a while back, it's extremely convenient.

[asid61]

Originally Posted by Oblarg

Nice touch with the socket output. I did this on one of my gearboxes a while back, it's extremely convenient.

Convenient for the designer definite. As far as using it goes though I prefer having a 1/2" hex output;it's easier for me to connect both sides of the drive for PTO use, and you can more versatility with the placement of your sprocket or pulley or whatever.

[izz]

Hi, I tried to open the CAD file, but it would not on my computer because I use Autodesk Inventor instead of Solidworks. Could you upload step files instead of Solidworks files? If not, does anyone know how to convert the files from Solidworks to Inventor or step? I read online that it was possible to open them in Inventor, but I have tried multiple times and it is not working. Thanks in advance.

[cad321]

Originally Posted by izz

Hi, I tried to open the CAD file, but it would not on my computer because I use Autodesk Inventor instead of Solidworks. Could you upload step files instead of Solidworks files? If not, does anyone know how to convert the files from Solidworks to Inventor or step? I read online that it was possible to open them in Inventor, but I have tried multiple times and it is not working. Thanks in advance.

What I will do in situations like this is upload the files to my personal workbench account, and then re download them as a step file.

[asid61]

Originally Posted by izz

Hi, I tried to open the CAD file, but it would not on my computer because I use Autodesk Inventor instead of Solidworks. Could you upload step files instead of Solidworks files? If not, does anyone know how to convert the files from Solidworks to Inventor or step? I read online that it was possible to open them in Inventor, but I have tried multiple times and it is not working. Thanks in advance.

I can upload as a step. Give me a few minutes.
Solidworks only opens up older Inventor versions, the same could be true of Inventor.

EDIT: It's in the partner space now.