... reduced the limit to 1:1, although the results are less than perfect in some respects, especially timbering. I have relaxed the limit only to allow some special partial templates, it's not intended that a full 1:1 template should be usable in practice. I have amended that to 1:1.5 as the bottom limit (33.7 degrees). Sharper angles cause too many problems in the geometry, and in any event such templates are not prototypical using conventional chairing and construction. Here's the result at 1:1.5 2_032329_330000000.png Notice that the diamond-crossing is usable with only minor tidying up. But the turnout is absurd -- radius 98mm in P4. regards, Martin. Parts of Templot Club may not function unless you enable JavaScript (also called Active Scripting) in your browser. Templot Club> Forums> Templot talk> Irregular Diamond Vee Wing Rails 'Joggled' !! about Templot Club Templot Companion- User Guide- A-Z Index Templot Explained for beginners Please click: important information for new members and first-time visitors. ...