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Member postings for Martin Rock-Evans

Here is a list of all the postings Martin Rock-Evans has made in our forums. Click on a thread name to jump to the thread.

Thread: The Chocolate Fireguard as designed by Mercedes Benz
08/05/2019 17:54:29

With all this talk of range, it reminds me that my poor old Spitfire was lucky to get 120 - 150 miles between fill-ups. We've all become used to the convenience of 140 or so years of internal combustion development. Give it a few more years of electric car and infrastructure development...

Thread: 20 degrees vs 14.5 degrees pressure angle for gears
15/01/2018 19:36:50

Many thanks all for the advice and support. Neil, I'm slightly confused by your comment about undercutting, if the tooth form requires undercutting, I'm guessing that can't be done by a disc shaped gear cutter?

14/01/2018 20:45:23


I'm looking to make a set of spur gears for my 3" Burrell. The drawings show these as 10 DP with a 20 degree pressure angle and between 17 and 70 teeth, however I'm struggling to find an affordable set of cutters with a 20 degree pressure angle (£100+ a cutter is not affordable). RDG Tools do an affordable set of 10 DP gear cutters at 14.5 degree pressure angle. How much of a difference would the two pressure angles make (understanding that the whole train needs the same DP and pressure angle) or can anyone recommend a supplier who can supply 10 DP gear cutters with 20 degree pressure angle.

Many thanks,


Thread: Digital editions of Model Engineer and Model Engineers' Workshop.
06/04/2010 11:30:27
Hi David,
I'm experiencing the same problems as Hugh was. Using either Internet Explorer or Google Chrome, when the pop-up that usually has the digital magazine in it appears it simply has the text:
A licensing error does not
permit you to View this Document

Contact your supplier for more information
I get the same message for all the back issues and these have been working in the past.
Many thanks, Martin 
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