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Payupv8 03-05-2018 11:45 AM

Tips on measuring a radius
 
I am looking for a way to measure a radius on a fender Iam making a pattern off of I has a gradual radius and my radius gauge doesn't have the exact match Iam looking for a quicker/easy way to find the start the middle and the end of the radius so I can map it out on my pattern and duplicate it on the new panel. These are some of the things I struggle with when making patterns

norson 03-05-2018 11:58 AM

2 Attachment(s)
I use radius gauges like those pictured. If the curve is to long or too severe I make it in several pieces and then fit them to the panel and clamp/staple them together.


Norm

Attachment 45846

Attachment 45847

crystallographic 03-05-2018 02:33 PM

Quote:

Originally Posted by Payupv8 (Post 144337)
I am looking for a way to measure a radius on a fender Iam making a pattern off of I has a gradual radius and my radius gauge doesn't have the exact match Iam looking for a quicker/easy way to find the start the middle and the end of the radius so I can map it out on my pattern and duplicate it on the new panel. These are some of the things I struggle with when making patterns

I use a straightedge to determine the start and end of any radius, and then mark the panel accordingly.

I make paper patterns both whole and in segments, like Norson recommended.

The handy shortcut for me to copy a profile is to use a gauge like these:
http://www.tinmantech.com/html/profile_gauge.php

norson 03-05-2018 04:46 PM

That's where I got mine.:D
Norm

Payupv8 03-05-2018 07:54 PM

Thank you for the feed back, I usally do use a straight edge. I have a profile gauge that I got from the home improvement store, it's not as nice as the tinman ones. I'll try to snap a picture of the radius Iam having a hard time with its a very gradual radius

cliffrod 03-05-2018 08:41 PM

Another option between the cheap home improvement store version (I've got a couple of them..) and Kent's nice one (don't have one of those yet)-

Years ago I ended up with a small contour-radius gauge made from a stack of index card weight cardstock. There are heavier top and bottom exterior covers. The cards are slotted, with two? long thin bolts & nuts passing through it all. Loosen the bolts, fit to the contour and tighten the nuts. Because the cardstock leaves are so thin in comparison to other contour gauges I've seen and used, it registers really well and won't scratch a surface. Measured length is around 3" iirc.

Always thought I would make a larger version, ideally from comparable gage sheet plastic instead of actual cardstock, when I felt like punching lots of holes and trimming slots. but I haven't yet.

I also use multiple patterns (trimmed paper, cardstock/chipboard and numerous existing patterns) in unison to record & duplicate a profile.

norson 03-05-2018 10:07 PM

3 Attachment(s)
this is the contour gauge I use for the curve I think you're describing.
Norm

Attachment 45849

Attachment 45850

Attachment 45851

billfunk29 03-06-2018 12:20 PM

radius measurement
 
Expensive but quick and accurate.
https://www.baileigh.com/index.php/i...SABEgJoGvD_BwE

Bob 03-07-2018 10:34 AM

Hoyle makes some products for creating or copying curves and radius's. I've had their adjustable curves for years and like em a lot. They also make an adjustable ruler that can measure a radius. It goes from 7" to 200" so has quite a range, just not a real small range. I don't have one, but always wanted one. It only works on internal radius, but with the curve I can get that easy enough.

Secant 03-09-2018 05:46 AM

https://www.mathopenref.com/arcradius.html
A relatively simple calculation that can be measured from the convex side by making a simple tool. This only works if you have an actual radius, and not merely a faired line.


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