Past project, tangent handrail

[Oldboy22]

Hi
Lower bevel twist angle.

Strike an arc from B to F on the lower undeveloped tangent ( ie at 90deg to the tangent) all in purple and rotate to G, draw a line from G to X . The angle needed is 66 deg as shown in purple.

I hope you agree nothing complicated about that, talking about myself trying to learn from books is harder than I’ve shown , I feel this is complicated stuff and the authors assume you can decipher their drawings. Anyway I hope I’ve helped someone.

Next another way of obtaining the lower bevel

F is underneath the C in the drawing and might not be seen at first glance.
Brian

[Oldboy22]

Lower bevel 2

Draw horizontal and vertical lines 1-2-b above the upper inclined tangent ( in purple) extend the lower undeveloped inclined tangent up as shown dashed purple line.

Draw a radius from 2 to just kiss the line as shown.

Transfer this radius to B and strike arc to base line draw line to point P the resulting angle is 66deg as shown and the same as previous method proving the are both correct.

Next and last method produces both bevels at either end and is my favourite.

Brian

[Oldboy22]

This method is the best and most accurate in my opinion, the end where you develop the twist bevel is the end it applies to, strike an arc from “a” to the developed tangents in blue ( ie at 90 deg to the tangents) as shown, from there draw a line at a tangent to the plan radius copied from the plan the angles are measured as shown in purple ( lower) and orange (upper) and are 66 deg and 60.2 deg respectively.

They are the same as all the previous methods proving they are correct, I always draw the bevels two ways to double check.

This is the last one for this particular layout, but if anyone has another method I’d be keen to see it.

Brian

[Oldboy22]

To anyone following this , another way of drawing the last method and maybe understand it better is to draw the radius in the plan (in red) and the length of the purple and orange lines from the same centre , and draw a line tangential to the radius in the plan hence given the required bevel.
Brian

[Meccarroll]

This was a good post although I did not understand your drawing method. I'm not sure I'd want to learn it either as the one I used worked just fine. Maybe in the near future we could revive the subject in a new thread.

No problem I’m not asking anyone to learn my method but at nearly 50,000 view’s someone is looking regularly and I have time on my hands so why not, it’s fun for me.

Well it's nice to here you are still practicing Brian. As I am at work I don't get the amount of time I'd like to study and practice the subject but I do intend re-visiting the subject in the near future. I will probably look over what you have done too. The book I mainly use and find easier to understand than some others on the subject is the one by W & A Mowat. Ironically it's a book that a lot of readers find most difficult to understand LoL.

[Oldboy22]

This was a good post although I did not understand your drawing method. I'm not sure I'd want to learn it either as the one I used worked just fine. Maybe in the near future we could revive the subject in a new thread.

No problem I’m not asking anyone to learn my method but at nearly 50,000 view’s someone is looking regularly and I have time on my hands so why not, it’s fun for me.

Well it's nice to hear you are still practicing Brian. As I am at work I don't get the amount of time I'd like to study and practice the subject but I do intend re-visiting the subject in the near future. I will probably look over what you have done too. The book I mainly use and find easier to understand than
some others on the subject is the one by W & A Mowat. Ironically it's a book that a lot of readers find most difficult to understand LoL.

Hi Mark it’s a case of use it or lose it for me, I hadn’t touched it for about a year and struggled a bit to remember the sequence but got there In the end and enjoyed the process. I’d definitely contribute if you started a new thread and always willing to learn new techniques.
Brian

[Oldboy22]

The views on this thread continue to rise, so because there is so much interest I thought I’d post a question on this drawing to see if anyone would like to offer a solution.

How did I get the length of the major axis of the ellipse?. Ellipse in green.

Like I’ve said before I am not a master of this subject but a keen amateur so any mistakes, please point them out.

Brian

[Oldboy22]

How to get the major axis for the above drawing, version one copied from “SBE Builders” website. Or put it another way learned from that website.

[Oldboy22]

Version two or my version I say mine because I haven’t seen it anywhere else, and came up with it on my own. Now I’m not say this will work in all situations because I don’t know. If not self explanatory please ask.

Brian

[Oldboy22]

Forgot to point out there is a different way of getting the upper bevel shown in the previous drawing, in case anyone didn’t notice.
Brian

[Oldboy22]

Here’s the last of the obtuse plan drawings this one has a lower level tangent, the drawing above is an upper level tangent plan, the equal pitch obtuse plan is on the previous page. You will notice all drawings need a different approach.

Brian.

[Oldboy22]

Here’s an example of an elliptical plan lower level tangent, use ordinate method to transfer dimensions from the plan to the development.
Brian

[Oldboy22]

Here’s a link to machine shaping handrails for anyone interested

https://youtu.be/PAIcxzQTAXE

Brian

[Oldboy22]

Part 2

https://youtu.be/rVjpG63nVi0

[Oldboy22]

Another handrail video

https://youtu.be/gQTwGcVhtrY

[Oldboy22]

And another, some good cutting tips in these .

https://youtu.be/rmE1wMDmFNk

[Oldboy22]

I’ve subscribed to the above channel, excellent content and plenty to watch if you’re interested in tangent handrails.

[Meccarroll]

I’ve subscribed to the above channel, excellent content and plenty to watch if you’re interested in tangent handrails.

Yes took a look at the video Brian and looks interesting. Not had much opportunity to study the subject this summer I'm afraid but nice to see you still posting.