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Learning how to build Lotus Seven replicas...together!
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PostPosted: January 12, 2020, 9:42 am 
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Location: Summerville, SC
davew wrote:
Nice!! cleaned up really good. My question is how did you unload it into the garage?
Davew


My Horrible Fright engine crane does all the heavy lifting around here. Everything from getting the A Mod or 7 onto and off of the table, to loading and unloading equipment.
Wifey Dearest nearly lost her mind a couple of months ago when she saw the milling machine dangling in the air.

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OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: January 12, 2020, 9:43 am 
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Miatav8,MstrASE,A&P,F wrote:
Nice. Big enough yet not too heavy.

Exactly. It's a huge improvement over the Grizzly mini lathe, but not a full on industrial machine.

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Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: January 13, 2020, 2:39 pm 
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Sean in CT wrote:
Nice i have a 13" Southbend which is pretty similar.
I think Craftsman was made by Atlas, in case you need parts
homeshopmachinist.net is a good forum for weekend guys
practicalmachinist.com is good to, but they generally dont like home machine questions

I bought the import Aloris style quick change tooling to replace lantern tool post - awesome upgrade! make set up faster, quick tool changes and much more rigid. I use the CXA size. Bigger is better!

https://www.ebay.com/itm/CXA-Wedge-Tool ... SwLKhcMQqm


CXA - heavy duty. That would be the most robust piece of this lathe by far.

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Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: January 14, 2020, 4:15 pm 
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It wasn't until I started playing around with VSUSP that I realized what a difference (in theory at least) that the smallest changes have on your suspension geometry.

Change tire width, redo your numbers
Change rim width, redo your numbers
Change rim offset, redo your numbers
Change static ride height, redo your numbers

Eventually I looked at the numbers and realized that tweaking beyond (and sometimes to) the second decimal place I'm just kidding myself. I'm not going to get the suspension pickup points located in 2D space to the thousandth of an inch. So with that in mind, what do I do? you guessed it, redo my numbers.
I started looking at perfect and seeing what the impact was if I miss ideal by 1/16". Roll center starts moving around a bit, not terrible.
What if I change tire size? from 245's to 225's. BIG changes.

Then I looked at ease of getting LCA's where they needed to be on this particular chassis, not so good. The distance from centerline is a good bit inside the frame rails. Far enough to be a bit of concern on droop, so I found a nice compromise between where I started and the ideal that Mv8 worked out and decided to roll with it. It's better than where I started, worse than Mv8's numbers, and close enough for Government work.

Going over where everything ACTUALLY landed after being tacked up I have all 8 pick up points within 1/16" inch of my targets.
Next up a work trip, then fabricating control arms.

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Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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PostPosted: January 14, 2020, 4:18 pm 
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The other key learning as a result of this exercise.

The NEXT car I build is going to start with wheel and tire selection. Nail that down as step 1.
Then design suspension pickup points around a ride height. Pick my brackets and lock them down so I have the offsets from hole ceterline to mating face with the chassis.

Only with those 2 items done will I start to draw a frame.

_________________
Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


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