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  #1  
Old March 8th, 2016, 07:50 PM
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Machinist Request for Quote

I just posted an RFQ on www.cnczone.com and www.practicalmachinist.com but wanted to check here too.

Here is what I need:


Looking to have this made in steel. I can export in DWG DXF STL SVX and SAT

Any advice, tips or quotes would be appreciated.

Thanks
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  #2  
Old March 9th, 2016, 05:41 PM
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No Machinists in the house?
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Old March 9th, 2016, 11:58 PM
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why not just get it done by emachineshop? just download their software, upload your spec, and off you go...
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Old March 10th, 2016, 08:13 AM
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never heard of it, will google. Thanks Randy
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Old March 10th, 2016, 09:19 AM
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they're awesome. they've done a number of custom vintage ducati cycle parts for me, and i only used their software. pricing is immediate (and you can see it change when you change materials, etc.) and they're fast. shipping is fast too, they're in NJ.
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Old March 10th, 2016, 09:29 AM
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Just FYI....some parts of that design made out of steel would make it very expensive.

There are two cheap pieces to make in your design. Three would be impossible to make for a reasonable price.

The opinion of a non-machinist.
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Old March 10th, 2016, 10:33 AM
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Quote:
Originally Posted by rankar View Post
they're awesome. they've done a number of custom vintage ducati cycle parts for me, and i only used their software. pricing is immediate (and you can see it change when you change materials, etc.) and they're fast. shipping is fast too, they're in NJ.
But not cheap. I have made a few preproduction prototypes with them. It usually took 8-9 weeks for me on average to have 3-4 units made, by no means the drawings were simple to make.

Their software is pretty good and works well.

I had some machined and they asked me if they could use it as a demo on their website, I told them no as it was a prototype.

They get their work done right but cheap and fast are not what I used to describe them in my experience if you give them anything complex.
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Old March 10th, 2016, 12:11 PM
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Quote:
Originally Posted by sonoronos View Post
Just FYI....some parts of that design made out of steel would make it very expensive.

There are two cheap pieces to make in your design. Three would be impossible to make for a reasonable price.

The opinion of a non-machinist.
I have the "economy version" completed also. This is the way I originally sketched it so wanted to see what the damage would be. My best quote so far is 2X what I was hoping for. I'm going to see some guys in Brooklyn with wire edm and a water jet.
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Old March 10th, 2016, 06:30 PM
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Looks like I need to take off the radius ends and give up the curved face on the red piece.

if only I could 3D print metal (printed this in ABS, shouldn't of ran the fan, hence the cracks):



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Old March 10th, 2016, 06:54 PM
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What are you planning on putting up there? What weight capacity are you going for?

-Jeff
My fully loaded yakima sky box was about 300 pounds loaded with all our camping stuff. I can't imagine putting much more than that up there.

My main goal is to make a low profile flat platform that I can chuck one of my small GTT tents on the roof.

From the calculators that I played with online it looks like I'm well over 1000 lbs static with about 1/8 deflection at each rail. I haven't redone the deflection with .065 wall tube (used .120 before I realized that was way to much metal).

It's shooting from the hip design work for sure.

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  #11  
Old March 13th, 2016, 10:58 AM
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That's sweet oscar
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  #12  
Old March 13th, 2016, 11:03 AM
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Static loads would not set the design criteria. It would either be wind or braking loads.
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Old March 13th, 2016, 11:08 AM
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my concern with that design would be weight - i am no engineer - but it seems the middle of that would sag with weight onto the roof?
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Old March 18th, 2016, 11:52 PM
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Originally Posted by Jonesy View Post
my concern with that design would be weight - i am no engineer - but it seems the middle of that would sag with weight onto the roof?
It absolutely would sag but looking at a couple of deflection calculators I would have to go to about 600lbs for aluminum and 1000 lbs for steel for it to touch the roof (based off of my loose understanding of the material).

I'm having a good time playing with it all, and I have access to a materials lab now that I'm taking a few engineering classes at the local CC (thank you GI Bill).

Hey It's a piece of metal on a roof. They sell sheet metal tube ones at Walmart. How hard can it be?[/famous last words]





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