Radius gauge and reverse engineering

**tonyfoale** · Dec 22, 2018, 03:28 AM

I recently posted about some reverse engineering that I needed to do to replicate some classic motorcycle crankcases at
http://www.homemadetools.net/forum/h...029#post120271

Continuing on from that I needed to measure some corner and other radii, there are many possibilities for such tasks, for example MichaelMoore recently posted his templates at
http://www.homemadetools.net/forum/r...348#post122031

This current post is about a set of radius gauges that I built using a digital gauge as the measuring element.

Radius gauge and reverse engineering-radius-gauge-06.jpg

Radius gauge and reverse engineering-boxed.jpg

Radius gauge and reverse engineering-radius-gauge-11.jpg

I have put the full story in a PDF which can be seen and/or downloaded from:
Tony's radius gauge
I have also written a simple bit of software to perform radius calculations and that is linked in the PDF file. I will also add a video in the next few days.

**yves78** · Dec 25, 2018, 01:44 AM

Thanks a lot Tony : 2 days ago, I was just thinking to build something similar in order to evaluate a radius.

That's very nice to get an idea of your solution for that.

I take also the opportunity of that reply, to thank you for your pdf explanation documents, always clears and usefuls.

**tonyfoale** · Dec 25, 2018, 09:48 AM

Originally Posted by yves78

Thanks a lot Tony : 2 days ago, I was just thinking to build something similar in order to evaluate a radius.

That's very nice to get an idea of your solution for that.

I take also the opportunity of that reply, to thank you for your pdf explanation documents, always clears and usefuls.

Glad that you find it useful. If you make something like it be sure to post it here.

**NortonDommi** · Dec 25, 2018, 11:52 PM

Thanks, I've put this in the to do list for Winter.

**Toolmaker51** · Dec 26, 2018, 09:42 AM

Originally Posted by NortonDommi

Thanks, I've put this in the to do list for Winter.

WELL it's winter here, hint hint. Weeks and weeks worth...

**Toolmaker51** · Dec 26, 2018, 09:44 AM

Originally Posted by tonyfoale

I recently posted about some reverse engineering that I needed to do to replicate some classic motorcycle crankcases at
http://www.homemadetools.net/forum/h...029#post120271

Continuing on from that I needed to measure some corner and other radii, there are many possibilities for such tasks, for example MichaelMoore recently posted his templates at
http://www.homemadetools.net/forum/r...348#post122031

This current post is about a set of radius gauges that I built using a digital gauge as the measuring element.

I have put the full story in a PDF which can be seen and/or downloaded from:
Tony's radius gauge
I have also written a simple bit of software to perform radius calculations and that is linked in the PDF file. I will also add a video in the next few days.

I can't recall anything on the market or DIY anything like it. Seems Tony, you knock two thirds the competition off before they get in the pit let alone on track. Said other way; He's lapping them right inside the shop?

Further; Jon. Is there a HMT.net logo decal for Tony's machine? What an audience!

**tonyfoale** · Dec 26, 2018, 03:31 PM

I have just enhanced the software to allow calculation of the curve radius and centre coordinates when the XY coordinates of three points on a curve are known.
This is useful if you use the DRO on a milling machine to determine the coordinates of three points. This does not need the radius gauge described above.
The link to the software is the same as that in the PDF RadiusGauge.pdf

**tonyfoale** · Dec 26, 2018, 04:46 PM

I have not had time to edit the video that I promised so I have just uploaded a 3 minute unedited version of the most interesting part of the radius gauge construction.https://motochassis.com/FileDump/Rad...adiusGauge.wmv

**DIYer** · Dec 27, 2018, 07:05 AM

Thanks tonyfoale! We've added your Radius Gauge to our Measuring and Marking category,
as well as to your builder page: tonyfoale's Homemade Tools. Your receipt:

Radius Gauge by tonyfoale

tags: gauge, radius