Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-09-2016, 12:45 PM   #11 (permalink)
...beats walking...
 
Old Tele man's Avatar
 
Join Date: Jul 2009
Location: Tucson, AZ
Posts: 5,792
Thanks: 146
Thanked 1,297 Times in 967 Posts
I do NOT know exactly what the torsional loads might be at highway speeds (+50% for headwinds!) but end activation could "un-snap" your connections (unless your plan is to ultimately glue them together). A center activation would greatly reduce that torsional load, whatever it is.

__________________
2014 Toyota Prius 1.8L eCVT
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-09-2016, 02:24 PM   #12 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 9,985

CM400E - '81 Honda CM400E
90 day: 53.89 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 38.47 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,547
Thanked 1,878 Times in 1,158 Posts
Again, thought provoking ideas Old Tele Man. Perhaps I should bias the blade pivot point so that the wind holds it shut at speed? With the blade open, it won't take much force to keep it in that position. The door lock actuator has some friction to overcome with the gearing inside of it, so it will help hold the block in place at what ever position its at, but a little help never hurt.
__________________
Current project: Automatically actuated grill block
  Reply With Quote
Old 11-16-2016, 09:14 AM   #13 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 9,985

CM400E - '81 Honda CM400E
90 day: 53.89 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 38.47 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,547
Thanked 1,878 Times in 1,158 Posts
Here are a couple more pictures. I got the actuator mounting bracket designed.





Here it is with the actuator shown. This more accurately shows the scale of things. The grill block is not that large. The entire assembly is only 3" tall and 9" wide currently. It will get larger to add some sort of mounting provision. I just haven't gotten that far.





Next step is designing the linkage between the actuator and the blade. This has been proving tricky as I'm running out of room.
Attached Thumbnails
Click image for larger version

Name:	grill1.jpg
Views:	271
Size:	45.0 KB
ID:	20915  Click image for larger version

Name:	grill2.jpg
Views:	270
Size:	49.6 KB
ID:	20916  
__________________
Current project: Automatically actuated grill block
  Reply With Quote
Old 11-16-2016, 12:11 PM   #14 (permalink)
Master EcoModder
 
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 333

Eeyore - '04 Honda Civic Hybrid

Go Pod - '00 Honda Insight AC

The Tinyvan - '07 Honda Fit Sport
Thanks: 89
Thanked 145 Times in 99 Posts
At this point, wouldn't a rotary actuator actually be better/easier to interface?

Red Dot-Red Dot Electric Operated Rotary Sealed Servo Actuator 12V 4-Pin - 71R3576 - RD-5-9063-0P-71R3576
  Reply With Quote
The Following User Says Thank You to samwichse For This Useful Post:
Daox (11-16-2016)
Old 11-16-2016, 12:22 PM   #15 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 9,985

CM400E - '81 Honda CM400E
90 day: 53.89 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 38.47 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,547
Thanked 1,878 Times in 1,158 Posts
It is quite possible that a servo would work better for the application, especially if it were smaller in size. The reason I keep going to the door lock actuator is price. These door lock actuators are $5 shipped. How cheap can you get servos for? If you can link me to a good priced one I'd definitely be interested. The whole thing will be arduino controlled, so controlling it is not an issue.
__________________
Current project: Automatically actuated grill block
  Reply With Quote
Old 11-16-2016, 12:34 PM   #16 (permalink)
Master EcoModder
 
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 333

Eeyore - '04 Honda Civic Hybrid

Go Pod - '00 Honda Insight AC

The Tinyvan - '07 Honda Fit Sport
Thanks: 89
Thanked 145 Times in 99 Posts
20KG Metal Gear High Torque Wide Angle Digital Waterproof Servo for RC Robot PZ | eBay

Claims 20kg force on a 1cm arm. Derate by 50% and double the arm length and you're still looking at 5kg, that should be enough, right?

Waterproof, all metal geartrain, works on 5v. $14.89 + $8 shipping

Also:
Towerpro MG958 55g 20KG High Torque Digital Metal Gear Servo | eBay

20kg, metal gear, not waterproof, $14.83, free shipping

Lots of pretty cheap options on ebay for servos nowadays.
  Reply With Quote
Old 11-16-2016, 12:49 PM   #17 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 9,985

CM400E - '81 Honda CM400E
90 day: 53.89 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 38.47 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,547
Thanked 1,878 Times in 1,158 Posts
I actually have some radio control servos kicking around the house. I bet even those little ones have enough power to actuate the grill. I'm not sure about holding it in place... but we'll see. I can design it so the wind speed holds it shut. I like the servo idea though. Also, I looked on amazon and you can get 2X micro servos for about $8. Its WAY smaller than the door lock actuator and would be much easier to integrate into the design. Thanks for the idea!

https://www.amazon.com/TowerPro-SG90...ds=micro+servo
__________________
Current project: Automatically actuated grill block
  Reply With Quote
Old 11-16-2016, 07:08 PM   #18 (permalink)
...beats walking...
 
Old Tele man's Avatar
 
Join Date: Jul 2009
Location: Tucson, AZ
Posts: 5,792
Thanks: 146
Thanked 1,297 Times in 967 Posts
"It takes a COMMUNITY to design a grill block."
__________________
2014 Toyota Prius 1.8L eCVT
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M
  Reply With Quote
Old 11-17-2016, 09:02 AM   #19 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 9,985

CM400E - '81 Honda CM400E
90 day: 53.89 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 38.47 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)
Thanks: 1,547
Thanked 1,878 Times in 1,158 Posts
Quote:
Originally Posted by Old Tele man View Post
"It takes a COMMUNITY to design a grill block."
It certainly helps to have a wealth of knowledge kick in their ideas! Thanks guys.

I dug through my radio control stuff and found a micro servo. Its really quite small (mechanical pencil in the picture for scale) but does have a pretty great amount of holding power. I was a bit surprised about that. The gearing must be a pretty tall ratio. Anyways, I think I should be able to mount it directly inline with the lever arm that actuates the blade.

Attached Thumbnails
Click image for larger version

Name:	servo.jpg
Views:	243
Size:	67.6 KB
ID:	20920  
__________________
Current project: Automatically actuated grill block
  Reply With Quote
Old 11-17-2016, 11:07 AM   #20 (permalink)
EcoModding Lurker
 
Join Date: Oct 2016
Location: United States
Posts: 68

Delta Flyer - '94 Honda Accord
90 day: 31.31 mpg (US)
Thanks: 4
Thanked 22 Times in 20 Posts
Daox already answered this for me but asked I post my question here:

Quote (Originally by RoadCyclist)---
Hey, I was reading you Arduino grill block thread and was wondering: How are you programming the Arduino? Is it linked to the engine computer? Also, how are you powering the servo and MC?

I'm asking because I have an Arduino and can do some simple tricks with it, and was thinking about copying your design if that's all right with you, assuming it works out.

  Reply With Quote
The Following User Says Thank You to RoadCyclist For This Useful Post:
Daox (11-17-2016)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com