The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1969 - 1972 Blazers and Jimmys Message Board > 1969 - 1972 Blazers and Jimmys Projects and Builds

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-16-2020, 02:54 AM   #1
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Motorized Rocker Panels

My blazer is lifted and currently wearing 37s so I was looking at step options and haven't seen anything I was crazy about. I like the stealth power steps that tuck behind the rocker but since its not possible with the blazer rocker boxes I had the crazy idea of turning the outer rocker into a motorized step.

My idea was to cut the lower section of the rocker off just above the door ledge and fabricate a new lower section out of some thicker material for the step. I think there is just enough room between the inner and outer rocker to put some linkages to let the step drop down. Worst case, a shallow pocket would have to be made into the inner rocker.

I'm thinking a miata headlight motor wired up to the courtesy light switch and a crank/rocker 4 bar linkage would eliminate the need for any type of motor controller. The motor and 4 bar linkage would be behind the inner rocker in the rocker box area. Not sure if the motor would be strong enough on its own but could easily put some helper springs somewhere to help take some load off.

I made a rough cad model of the concept. See it in action here >https://youtu.be/1amkfH_XQ6M

Any thoughts?
Attached Images
     
stangtjk is offline   Reply With Quote
Old 02-16-2020, 12:27 PM   #2
boonedogs72
Registered User
 
boonedogs72's Avatar
 
Join Date: Apr 2005
Location: redding ca
Posts: 1,387
Re: Motorized Rocker Panels

Damn cool idea!
boonedogs72 is offline   Reply With Quote
Old 02-17-2020, 04:38 PM   #3
DemkoG
Registered User
 
Join Date: Nov 2013
Location: Suffield CT
Posts: 53
Re: Motorized Rocker Panels

Defiantly a cool idea. would they hit a stop or would the motor have to support the weight of the person?
DemkoG is offline   Reply With Quote
Old 02-17-2020, 06:49 PM   #4
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Re: Motorized Rocker Panels

As long as no one ever tried to jump on the step while it's in motion the motor should never be supporting the weight of a person. With the step all the way down it would just be hanging by the two big linkages.
stangtjk is offline   Reply With Quote
Old 02-18-2020, 04:10 AM   #5
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Re: Motorized Rocker Panels

Worked on this idea a little more.

I plan on having some 1/8 plate CNC plasma cut for the step structure. I added locating tabs in the design to make fit up and welding easier. To maintain the contour of the outer rocker I was thinking it would be easiest to keep the lower section that gets cut off and reattach it to the step skeleton.

I went ahead and ordered some miata headlight motors to figure out the wiring and judge whether or not they'd be sufficient to raise the step.

I've got access to a manual mill and lathe however I have no machine skills so I tried to keep things simple in that perspective. For the hinge points I'm looking at off the shelf 3/4 stripper bolts and oilite bushings. Only machining work will be drilling, tapping and cutting a couple counter bores.

One part I'm still contemplating is how to pin together the links of the crank/rocker mechanism that will be driven by the motor. My thought was to use some pins/rivets similar to how a hood hinge is put together. I don't want to use nuts/bolts because that would require bends in the links for clearance and I think I'd have a hard time keeping the links the correct length to allow the 4 bar to operate correctly.

Will also need to factor in some kind of adjustment to maintain alignment of the rocker with the step closed. Not expecting a lot of slop but things have a way of moving around over time. Maybe a little adjustable bump stop similar to how the front of a car hood is aligned.
Attached Images
  
stangtjk is offline   Reply With Quote
Old 02-18-2020, 08:40 AM   #6
mcmlxix
Collector of Projects
 
mcmlxix's Avatar
 
Join Date: Apr 2003
Location: Las Vegas
Posts: 3,039
Re: Motorized Rocker Panels

https://rockslideengineering.com/
__________________
Rich
1972 K5 Blazer CST Click HERE

D60 BIG BRAKE UPGRADE Click HERE
mcmlxix is offline   Reply With Quote
Old 02-18-2020, 12:26 PM   #7
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Re: Motorized Rocker Panels

Quote:
Originally Posted by mcmlxix View Post
This ain't no jeep.
stangtjk is offline   Reply With Quote
Old 02-19-2020, 04:34 AM   #8
mcmlxix
Collector of Projects
 
mcmlxix's Avatar
 
Join Date: Apr 2003
Location: Las Vegas
Posts: 3,039
Re: Motorized Rocker Panels

Quote:
Originally Posted by stangtjk View Post
This ain't no jeep.
Your design looks like the same mechanical architecture as the Rockslide Engineering design as opposed to the AMP Research design...
__________________
Rich
1972 K5 Blazer CST Click HERE

D60 BIG BRAKE UPGRADE Click HERE
mcmlxix is offline   Reply With Quote
Old 02-20-2020, 12:11 AM   #9
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Re: Motorized Rocker Panels

Yeah, very similar. I tried looking for photos of the internals on those but not many images of the inner workings online. My design is a mix of the rock slide engineering steps and the Kodiak steps shown here> http://67-72chevytrucks.com/vboard/s...d.php?t=298589
stangtjk is offline   Reply With Quote
Old 02-20-2020, 01:17 AM   #10
stangtjk
Registered User
 
Join Date: Nov 2016
Location: Newport News
Posts: 246
Re: Motorized Rocker Panels

I sketched out a rough outline of the cross sections of the bottom of the door, outer rocker, inner rocker/floor and rocker box to adjust the design to fit. The model of the generic window motor I grabbed off grabcad looks bigger than what a window motor should. Not sure how accurate its dimensions are but I'll compare with the miata motors when they get here.

I originally tried keeping everything but the motor between the inner and outer rocker but it wasn't working out that great as the top of the step would have only been about 1-3/4" wide. So I'll be making a pocket in the inner rocker give room for a wider step. The top of the step in the image below is about 2 3/4" wide but I'll play around a bit more to see what I can gain. Would like to get close to 4" but its looking like 3 1/4" might be the limit without cutting into the rocker box.

More tweaking to do. One advantage to using a pocket is the assembly can be all put together off the truck and mounted all at once. Not exactly a bolt on mod but close as it'll get for being completely hidden.
Attached Images
 
stangtjk is offline   Reply With Quote
Old 05-25-2020, 01:05 PM   #11
Ol Blue K20
Just hanging out

 
Ol Blue K20's Avatar
 
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 11,448
Re: Motorized Rocker Panels

Any updates on this?
__________________
"Some Days Chickens And Some Days Feathers"

Dale
Ol Blue K20 is online now   Reply With Quote
Old 05-27-2020, 11:18 AM   #12
IGOR
Registered User
 
IGOR's Avatar
 
Join Date: Feb 2003
Location: Damascus, OR
Posts: 252
Re: Motorized Rocker Panels

Cool idea!
__________________
-Ben

1972 CST K5 - Undergoing frame off, 8.1/4L80E/NP205, 3/4 ton, 37" Krawlers, 8" lift, curently a pile of parts that when assembled resemble a Blazer
2002 GMC 2500HD - 4x4, Denali front end, WARN flares, 8.1/Allison, Leer 100XQ canopy, Nathan P3 train horn
2008 Scion XB

My blazer build thread:
http://coloradok5.com/forums/showthread.php?t=264786
IGOR is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:47 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com