CAD – Target Enigma

[David Jupp]

On David Jupp Said:

Dave,

I modelled a simple wheel with the wrapped 26 letters.

Your 4mm character height with 4.23mm line spacing gave a slightly enlarged gap between Z and A

If I did the sums to another decimal place 110/26 = (approx.) 4.231  than the result was near perfect.

Thanks David.  From your comment and Jason showing earlier how Alibre handles embossing on a curve, I believe SE makes comparatively heavy weather of this problem.  Might be doing it wrong but seems SE requires user to:

• create a tangent plane on the target surface
• draw a line on the plane on which to align the sketch later.  (Not strictly necessary but it helps!)
• create a text profile that’s then snapped to the line on the plane (several options)
• use another tool to wrap the text profile onto the curve.  SE seems to have a limited range when wrapping a vertical list round a tight curve.
• know that the usual Extrude tool doesn’t work properly, and he has to use ‘Normal Cutout’ or ‘Normal Protrusion’

Though I like SE it has it’s quirks!

Dave

[David JuppParticipant @davidjupp51506]

Dave,

I found in Alibre, that it did help a lot if the middle of the text sketch was close to the tangent point of the disc.  If I for example had the top of the A at that location, the wrap failed.  All CAD systems have quirks.

My main point was that you have to be a bit more precise with the sums when working out the line spacing, if you want nice even gaps.

[SillyOldDufferModerator @sillyoldduffer]

More done on the lamp assembly:

 

Pleased to say laying out QWERTZUID was straightforward.  After I realised this is a job for a fixed font!  Adjusting for a flat surface can be guesstimated and then tuned by eye.  Laying out vertically on a curve needs the maths and I shall have to have another go.

Wasted loads of time on the MES10 thread so the bulb isn’t properly modelled.  Have to pay for the standard IEC60061-1 and I haven’t been able to determine the thread form.  It’s rounded, not a recognised V, square, Whitworth, Sellars, or BS fastener profile.   Also seems to be a weird mix of metric and Imperial measure.  E10 is 10mm diameter (tap 8.8mm) and 14tpi. Maybe mixed because it was defined in the USA by electricians who have always been metric.

Dave

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