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View Full Version : how to draw a curve...

bct
04-15-2009, 11:19 PM
I have to make a curved flange to weld the sheet metal to when i make the new panel...you could bend a stick but it’s never consistent..I traced the sub rail

http://i41.photobucket.com/albums/e292/garetth123/mockup3april15003.jpg

..this is how to draw a curve...pound nails in your pattern at the ends of your curve and one at the peak in the center
Take two straight edges and make sure they are at least as long as your entire curve. Cross them over making sure that all three nails are being touched...like the pic...screw it or staple it together

http://i41.photobucket.com/albums/e292/garetth123/mockup3april15005.jpg
Mark the center of your guide and remove the center nail...put your pencil where the nail used to be and slide the guide making sure its touching the remaining two nails...perfect curve symmetrically

http://i41.photobucket.com/albums/e292/garetth123/mockup3april15006.jpg
French curve for the ends

http://i41.photobucket.com/albums/e292/garetth123/mockup3april15007.jpg
tinmann
04-15-2009, 11:24 PM
I'm not seein' the curve Garret. But I do know someone who needs to invest in a Shrinker-Stretcher.
Ford_Fellow
04-16-2009, 12:34 AM
Neat way to make your curve....sure help's to have a good pattern....
bct
04-16-2009, 12:51 PM
here ya go tin
http://i41.photobucket.com/albums/e292/garetth123/fendercut004.jpg
tinmann
04-16-2009, 03:37 PM
Holey moley....... I had to look at your pics for a long time.... then the lights finally came on. Yep, you're a genius.
49stovebolt
04-16-2009, 03:55 PM
I am like Tinmann..... It took me a while but the lights came on....:rolleyes: Good to know, thx.
Martin
04-18-2009, 01:50 AM
it would appear my lights are on but no ones home,
I aint gettin it?
49stovebolt
04-18-2009, 04:58 PM
Martin, once you take the centre nail out. Put the pencil in it's place in the corner (point). The two pieces of thin plywood can now slide back and forth along the two remaining nails thus drawing your curve as you move the pieces of plywood forward and back.

That's what I got from it... Hope I am somewhat right.
41 Bowtie
04-18-2009, 05:50 PM
What a neat trick, BCT. I've been a Mech designer/draftsman for the last 30+ years, first on the board and on CAD for the last 15 or so. I thought I new all the tricks when it comes to layout work. Just goes to show ya.

Good one.

Al
bct
04-18-2009, 07:02 PM
Martin, once you take the centre nail out. Put the pencil in it's place in the corner (point). The two pieces of thin plywood can now slide back and forth along the two remaining nails thus drawing your curve as you move the pieces of plywood forward and back.

That's what I got from it... Hope I am somewhat right.

100%...any curve you want...and its different than an arc...
Martin
04-18-2009, 10:06 PM
Just upgraded my brain from a 20 watt to a 100 watt, now I'ze aints so dim. ta