LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently January 17, 2020, 12:05 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 164 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11
Author Message
PostPosted: November 30, 2019, 3:43 am 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
This part will bolt to the diff on the ring gear holes. It's going to be part of my "cush" drive. The sprocket will have some pie shaped holes and I'll cast some rubber bushing for it. I'm planning on putting plates and a ring of UHMW plastic for everything to slide on.


Attachments:
cush_drive_base1.jpg
cush_drive_base1.jpg [ 184.29 KiB | Viewed 899 times ]
cush_drive_base2.jpg
cush_drive_base2.jpg [ 219.12 KiB | Viewed 899 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: November 30, 2019, 1:13 pm 
Offline
User avatar

Joined: October 24, 2008, 2:13 pm
Posts: 4109
Location: Carlsbad, California, USA
You have a very nice build, and a very interesting one too.

What is the material in the machined part in photo cush_drive_base1 above. It looks like aluminum most of the time, but steel other times.

Cheers,

_________________
Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


Top
 Profile  
Reply with quote  
PostPosted: November 30, 2019, 10:08 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
Yup, aluminum. Here's a render without the outer cover plate or the outer UHMW plate.


Attachments:
cush_drive_03.jpg
cush_drive_03.jpg [ 76.5 KiB | Viewed 867 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: December 1, 2019, 6:39 am 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 6340
Looks good. That must have taken a few days! I don't know if it is finished but you may not want to take any more material out of the base. If the bottom plate is too thin, the blocks can act as a lever and crack out of the base.

Have you decided on the durometer? Maybe an additive to prevent splitting/cracking of the inserts?

You can re add the lost pics by finding the same image name and leave or remove the old pic id with the number of views.

_________________
MV8

https://www.youtube.com/watch?v=Om3C1Ep ... D3E18BB447


Top
 Profile  
Reply with quote  
PostPosted: December 2, 2019, 2:07 am 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
The base thickness is about .200" where the lugs come out. I'll also have another 1/8" plate on the other side bolting into those lugs. Hopefully it'll have an ok fatigue life. I should have maybe finished that bottom corner with a BEM (radius).

And the milling wasn't as bad as I thought, a lot of material removal. 1/4" cutter, .070" dp, around 30 IPM. Although the machine did make some interesting new noises! Those high speed machining videos make me so jelly!

I'll use the rest of the urethane I used for the arm bushings and motor mounts. I think it was a 70. Once cured it is very tough. I have a little bit of an interference fit on the rubber parts, it seemed like the right thing to do (more engineering jargon).

I'll see if I can figure out how to re-add my old pics, without deleting the view count.

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."


Top
 Profile  
Reply with quote  
PostPosted: December 5, 2019, 4:25 am 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
Diff getting there.

Motor is a 2004, harness is a 2006 or 2007. Silly engineers decided to flip the connectors on the VSS. (vehicle speed sensor.)

Anybody got any clue as to the bare minimum of wiring I need to get it running right?

It's got an exhaust servo that operates a plate valve, which I don't have.
There's an intake solenoid, and maybe one other air intake valve.

Ideally I don't think I want any of that unless it needs it to run correctly.

The stuff I would assume I need is the MAP (manifold air pressure), CAM position sensor, Crank position sensor and air temp in the airbox.


Attachments:
diff_getting_there.jpg
diff_getting_there.jpg [ 188.62 KiB | Viewed 760 times ]
VSS.jpg
VSS.jpg [ 205.48 KiB | Viewed 760 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: December 7, 2019, 3:03 am 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
On a whim I stopped at the local parts/paint store and they sold me this for priming:

nason Ful-Poxy 491-16.

I cleaned up a couple arms and went for it. I have a little gravity feed paint gun with 1.0mm tip, the store recommended 1.5, but oh well, it seems to have worked.


Attachments:
arm_primer1.jpg
arm_primer1.jpg [ 193.52 KiB | Viewed 697 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: January 2, 2020, 5:14 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
I got it fully suspended! I took a wheebase measurement. The CAD measurement is 95.58", I'm either incredibly skilled or incredible lucky. Picture is measured edge to edge.


Attachments:
wheelbase.jpg
wheelbase.jpg [ 215.18 KiB | Viewed 386 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: January 2, 2020, 5:39 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
And me jumping up and down on it. Seems about right. I think the clicking is due to nothing really being bolted and tightened together yet, just bolts loosely sitting where they go.

Embedded link not working so:

http://www.youtube.com/watch?v=FFv6GF9ohSU


_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."


Last edited by Johnsinski on January 3, 2020, 6:23 pm, edited 3 times in total.

Top
 Profile  
Reply with quote  
PostPosted: January 2, 2020, 6:02 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
And the cush drive is coming together.


Attachments:
cush_drive_03.jpg
cush_drive_03.jpg [ 244.1 KiB | Viewed 384 times ]

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."
Top
 Profile  
Reply with quote  
PostPosted: January 3, 2020, 4:13 pm 
Offline

Joined: February 8, 2014, 10:47 pm
Posts: 512
Location: Cornholio OR "Where the magic happens"
I've always wondered if the gains from less unsprung weight of an inboard brake is better than being able to use the brake torque at the wheel to assist the rear suspension?

Nice work!

_________________
I don't know who I am, when I am somebody else.


Top
 Profile  
Reply with quote  
PostPosted: January 3, 2020, 6:22 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
Yea, I'm not sure I even thought about the forces on the upright and what it would do to the suspension. Hopefully the inboard rear brake will work, the uprights are still able to have brakes mounted to them for plan B.

I don't know what happened to the youtube video, it was showing when I posted it, but then it went away, hmmm.

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."


Top
 Profile  
Reply with quote  
PostPosted: January 3, 2020, 8:16 pm 
Offline

Joined: February 8, 2014, 10:47 pm
Posts: 512
Location: Cornholio OR "Where the magic happens"
I had a 3 link car once that had rotating caliper mounts with link going forward and angled to plant the wheel and it also eliminated wheel hop I believe.

Through A arm pivot angles you can get the same anti-dive effect as in the front. (also anti-squat which is the opposite)

_________________
I don't know who I am, when I am somebody else.


Top
 Profile  
Reply with quote  
PostPosted: January 5, 2020, 6:35 pm 
Offline
User avatar

Joined: April 19, 2018, 2:02 am
Posts: 146
My arm mount brackets can adjust the dive and squat. Well adjust isn't the right word, I can make different brackets to adjust that.

_________________
"It ain’t what you don’t know that gets you into trouble, it’s what you know for sure that just ain’t so."


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 164 posts ]  Go to page Previous  1 ... 7, 8, 9, 10, 11

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
POWERED_BY