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Learning how to build Lotus Seven replicas...together!
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PostPosted: December 11, 2017, 12:00 am 
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Location: No. Nevada
That may be a handy link for my planned "Not a Locost" Sports Racer replica/Miata builds.
And tonight while searching for El Camino fiberglass it looks like I may have found whole fiberglass Bugeye Sprite bodies!
Space-frame/Miata Bugeye? :twisted:

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PostPosted: December 11, 2017, 12:37 pm 
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Joined: January 31, 2008, 5:34 pm
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Interesting but I see lots of tube outside dimensions but no wall thicknesses. Anybody have an idea of what they should be?


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PostPosted: December 11, 2017, 1:11 pm 
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Joined: December 17, 2010, 1:24 pm
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Location: Gainesville, Mo.
Generally, .065"!

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PostPosted: December 11, 2017, 2:52 pm 
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OK. This is somewhat of a side issue. Something has bothered me for many years. Why, if 16 ga CRS (and HRS) is 0.0598" +/- 10% per ASTM stds, do some suppliers say 16 ga square tube is 0.065" nom? It doesn't sound like much but it is more than 8% thicker which has a larger effect on strength.

But to answer the one question, 16ga 1x1 tube, is the starting point for many of our builds.

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PostPosted: December 11, 2017, 5:11 pm 
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Joined: July 4, 2006, 5:40 pm
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Chuck, I measured a lot of my 16 gauge tubing from the online store at .065. Some of the stuff from my local hardware store is thinner, though. It probably depends on the manufacturer, +/- 10% is a pretty big tolerance.


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PostPosted: December 11, 2017, 6:13 pm 
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The ASTM standard doesn't mean anything in terms of a manufacturing requirement as long as the product is within tolerance. Manufacturers may choose to roll steel with a target thickness above nominal to provide a corrosion allowance. We had a reverse situation once where a shipbuilder was ordering steel at the lower end of tolerance. Shop primer would provide corrosion protection and the steel weight saved represented an input saving since the shipbuilder was ordering thousands of tons of steel, and paid for it on a weight basis. Any upcharge for a specified tighter rolling tolerance was more than offset by weight (=cost) saving.

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PostPosted: December 11, 2017, 9:48 pm 
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Nick, that is a big tolerance. But it is in the ASTM specification. With today's manufacturing improvements, I'm sure that the mills can hold much tighter tolerance. I know for large users, they can specify any range they desire. Some may favor the thicker range. I'm fairly sure that the auto mfgrs are very cognizant of weight so hold a very tight tolerance.

Warren, See the above reply to Nick. Again, when ordering tons of steel, they can specify anything they want. Anything that meets the purchase order requirements would be acceptable.

However, we purchase very infinitesimal amounts we are at the mercy of the mills for sure. So my question remains, why do they advertise 0.065" while the spec is nominally slightly under 0.060? Isn't square tube sold (to us anyway) by the foot and not by weight?

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PostPosted: December 11, 2017, 9:52 pm 
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Don't know if tthe 302 (Ford?) is significantly bigger than the Rover/BOP engine.


Just for the record the small block Ford is significantly smaller than the Buick/Rover V8 engines. The SBF has an 8.2" deck height most of the Buick/Rover engines have more like 9" or more.

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PostPosted: December 12, 2017, 10:03 am 
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True. I have several of each out in the shop.


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PostPosted: December 12, 2017, 11:11 am 
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Location: Cornholio OR "Where the magic happens"
What year Miata? 8)

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PostPosted: December 12, 2017, 11:14 am 
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Steel mills can hold much tighter tolerances, but you have to pay more for the tight control. Standard CRS sheet tolerance is .012" and half tolerance is .006" Most mfgr's want the steel mills to rolled the steel to low side of the tolerance, because you get more product per ton of steel. Must of the tubing we would buy would fall in on the low end of the thickness tolerance. Dave W


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