I'm making a racing chassis and I have now tried everything possible to cut it.

Ive used a chop saw.. Its **** for anything other than 90 degrees.. Its not even great at that.

I have a band saw.. Not accurate enough.

I have .05degrees tolerance on this chassis since its very short. It needs to be 100% square.. Not even a mm off is acceptable!

What can I use? Most cuts are like 113.5degrees or 85.. Nothing too rediculous.. but I need something thats pretty accurate.. whats up to the task ?

 

Cold Saw. A table bound one can be found for about 1000, new.

http://www.mcmaster.com/ Search Cold Saw, 2nd item down. That's the one we use, but we don't like that particular coolant pump at all, it doesn't hold line pressure, you have to prime it (suck on it) if it sits idle for more than 10 minutes.


Modified by Goullish at 4:43 PM 12/31/2004

 

is such a thing rentable ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Want2race &raquo;</TD></TR><TR><TD CLASS="quote">is such a thing rentable ? </TD></TR></TABLE>

Perhaps, but I wouldn't know where.

EDIT: Same search, last item, the table mount abrasive. It won't be as accurate as the cold saw, but it's a quarter the price. If you take the time to set up the peice it would work.

 

Are you welding together this infinitely accurate chassis? If so you can throw out your 0.05deg requirement unless you have a chassis jig made of 1/2" I-beam. IMHO that accuracy requirement is unobtainable.

 

i recently made a heavy (about 45lb) angle fixture that sits in my bandsaw, cutoff saw, bridgeport, etc. adjusts for 0-90. makes bandsaw pretty accurate and fairly simple. i can send pics if you think it might be an option.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Goullish &raquo;</TD></TR><TR><TD CLASS="quote">

Perhaps, but I wouldn't know where.

EDIT: Same search, last item, the table mount abrasive. It won't be as accurate as the cold saw, but it's a quarter the price. If you take the time to set up the eice
it would work.</TD></TR></TABLE>

i have one.. its not close enough!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike_belben@yahoo.com &raquo;</TD></TR><TR><TD CLASS="quote">i recently made a heavy (about 45lb) angle fixture that sits in my bandsaw, cutoff saw, bridgeport, etc. adjusts for 0-90. makes bandsaw pretty accurate and fairly simple. i can send pics if you think it might be an option. </TD></TR></TABLE>


can you send that to me?

 

Could you please explain why your chassis "must" be within 0.05deg? Is it suspension pickup points? If so there are *much* better ways of maintaining accuracy then what you're trying to do. What you are attempting will end with failure and frustration.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kb58 &raquo;</TD></TR><TR><TD CLASS="quote">Could you please explain why your chassis "must" be within 0.05deg? Is it suspension pickup points? If so there are *much* better ways of maintaining accuracy then what you're trying to do. What you are attempting will end with failure and frustration.</TD></TR></TABLE>

Nothing ends in failure! Everything is attainable.. It just takes tools or people with skills.

Its various parts, Its suspension pickup, its geometry and its weight distribution. Since the car wont have a roll cage I want there to be as much metal to metal contact prior to welding just to get every posssibly kpa of strength!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike_belben@yahoo.com &raquo;</TD></TR><TR><TD CLASS="quote"> i can send pics if you think it might be an option. </TD></TR></TABLE>

please do!

 

email my screenname. my PMs seldom work. title "HT fixture pics" so i dont delete it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Want2race &raquo;</TD></TR><TR><TD CLASS="quote">

Nothing ends in failure! Everything is attainable.. It just takes tools or people with skills.</TD></TR></TABLE>

I agree, but this approach will be very expensive and difficult to attain in a typical garage-shop environment. The trick is to attain what you want using the resources at hand. I'm sure for a million dollars it's a piece of cake, but that's not really the point.

For example, you can make a jig that IS accurate, that simply locates the suspension points. After the chassis is built, the jig is put in place to allow welding on the suspension pick-up points. That way any inaccuracies in the chassis don't matter. Obviously everyone has their own approach, but you're setting yourself up for failure right at the start, or at least a lot of grief. Are you planning to have non-adjustable suspension pivot points? Why?