Connecting hub sprockets to shafts

[archiver]

Posted by Joe Johnson at 2/2/2001 10:27 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: How about a Trantorque !
Posted by Ed Sparks on 2/2/2001 10:15 PM EST:



Zoinks! Do I feel stupid. I just bought some 10 mm
Trantorques and paid a bit more that what they cost to
have a machinist open them up to 11 mm specifically for
the purposes of using them with the Van Door Motors.

We did this last year and it worked extremely well.

Now that I know where to get 11 mm out of the box, I am
all set.

Thanks.

Joe J.

[archiver]

Posted by PAUL GIANNOSA at 2/2/2001 11:56 PM EST


Engineer on team #27, TEAM RUSH, from OSMTECH and TEXTRON AUTOMOTIVE CO..


In Reply to: Connecting hub sprockets to shafts
Posted by Patrick Dingle on 2/2/2001 7:17 PM EST:



: Does anyone know the most reliable way to connect a hub sprocket to a rotating shaft (no keyway)? We are planning to drill and tap the hub, and bolt slightly into the shaft. Is this reliable, or are there better ways?

: Thanks
: Patrick
HI PAT. JUST LOOKED @ SOME OF THE RESPONSES TO YOUR POST. I HAVE USED RAUL'S "DUTCHMAN" METHOD VERY SUCESSFULLY ON OUR WHEEL HUBS LAST YEAR AND I AM USING IT ON MY PLANETARY HUB WITCH REPLACES THE FRONT .5 OF THE DRILL MOTOR TRANS. THE DRILL SHAFT IS A CUSTOM ONE TURNED ON A LATHE FROM A GRADE 8 .75 BOLT. WE ARE ATTACHING A 16 TOOTH GEAR TO THE .472 DIA. SHAFT BY USING A DOWEL PIN. THE WAY I DID THAT ON LAST YEAR'S MACHINE WORKED REALLY WELL. WE NVR BROKE A GEAR OR SHAFT. WHAT I DO IS DRILL OUT THE 8/32 THREAD HOLE IN THE HUB TO .187 DIA. I DRILL AND TAP A LARGER 1/4-20 THD HOLE ON CENTER WITH THE .187 BORE. NEXT I BORE A .1875 DIA HOLE INTO THE .472 DIA DRILL SHAFT .200 DP. THIS IS SLIGHTLY LESS THAN HALF OF THE SHAFT. I CUT A .187 DOWEL TO FIT INTO THE GEAR AND SHAFT AND HOLD IT IN PLACE WITH THE 1/4-20 SET SCREW. I DON'T THINK YOU COULD GENERATE ENOUGH FORCE TO SHEAR A DOWEL PIN THAT IS ABOUT 45-55 ROCKWELL C. YOU ALSO MAINTIAN STRENGH IN THE SHAFT BY NOT BORING A HOLE COMPLETLY THROUGH. SORRY IF I'M A LITTLE WORDY. I CAN SEND YOU A AUTOCAD14 FILE SHOWING YOU GRAPHICALLY HOW I DO THIS. MY E-MAIL IS PMGRACER@AOL.COM

[archiver]

Posted by Joe Johnson at 2/3/2001 4:58 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Re: Connecting hub sprockets to shafts
Posted by PAUL GIANNOSA on 2/2/2001 11:56 PM EST:



Paul,

I am very interested in your design. Can you make a
jpeg of your AutoCAD screen as well as snap a digital
photo of your actual modifications?

I would love for you to upload some files to our Photo
Gallery. The upload feature allows you to put in some
explanatory text.

We would love to see it.

Of course a White Paper would be even better.

What do you say?

Joe J.

[archiver]

Posted by PAUL GIANNOSA at 2/4/2001 11:25 PM EST


Engineer on team #27, TEAM RUSH, from OSMTECH and TEXTRON AUTOMOTIVE CO..


In Reply to: upload a Jpeg to the Misc Photo Gallery.
Posted by Joe Johnson on 2/3/2001 4:58 PM EST:



: Paul,

: I am very interested in your design. Can you make a
: jpeg of your AutoCAD screen as well as snap a digital
: photo of your actual modifications?

: I would love for you to upload some files to our Photo
: Gallery. The upload feature allows you to put in some
: explanatory text.

: We would love to see it.

: Of course a White Paper would be even better.

: What do you say?

: Joe J.
HEY JOE J. I'M GLAD SOMEONE READS THIS STUFF. I CAN EMAIL YOU A AUTOCAD14 DRAWING/ BMP OR WHATEVER DATA YOU WANT. IT WOULD BE BEST IF YOU COULD GIVE ME A CALL TO MAKE ARAIGMENTS. MY PAGER # IS 810-418-1035. PAGER IS BEST. MY EMAIL ADDERSS AT HOME IS PMGRACER @ AOL.COM AND MY WORK MAIL IS PMG6 @DCX.COM. I JUST FINISHED WORK ON THIS YEARS MOTOR MOUNT SYSTEM. I GOT RID OF THE FRONT HALF OF THE TRANS, USING ONLY THE PLANETARY RING AND GEARS AND BUSHING, AND MAKNG A NEW "HUB SHELL" SO THAT YOU CAN MOUNT THE MOTOR SYSTEM OFF OF THE FRONT OF THE SHELL. THE TRANS BOLTS TO THE SHELL AND THE MOTOR IS CLAMPED TO THE SHELL. IT IS ALL ONE UNIT. I DID NOT USE THE PIN SET UP TO LOCK THE GEAR ON THE .472 SHAFT BEING WE ARE USING A 16 TOOTH HUBBED GEAR. THERE IS NOT ENOUGH MEAT TO USE A PIN. SO I MILLED A SLOT .125 DEEP IN THE SHAFT AND USED A .156 DIA END MILL TO PUT A .03 DEEP RADIUS IN THE GEAR. THIS WORKS LIKE A KEYWAY WITH A TWIST. I USED A .156 DOWEL PIN WHICH WILL NOT SHEAR. I STILL PREFER TO PUT THE PIN PERPENDICLUR TO SHAFT, BUT DESIGN WON'T ALWAYS COOPERATE. HOW IS YOUR ROBOT PROGRESSING? WE DROVE OURS UNDER ITS OWN POWER SAT @ 3:30PM. STILL ALOT OF STUFF TO FINISH THOUGH!!! TALK TO YOU SOON, PMGRACER