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Member postings for David Jupp

Here is a list of all the postings David Jupp has made in our forums. Click on a thread name to jump to the thread.

Thread: Is CAD for Me?
27/06/2019 13:07:42

Nigel - you can use Atom3D as a Viewer if you wish (without a licence) - but note you'll have to follow the instructions previously linked to remove the reference to the 6 month trial to unlock that possibility. Obviously it's only useful as a viewer if you have some files to view - so there may not be any value to you.

26/06/2019 15:33:25

Nigel - if you wish to re-install Atom3D so that you can then uninstall it correctly, you can download the installer from


Thread: Learning CAD with Alibre Atom3D
25/06/2019 15:18:38
Posted by Nigel Graham 2 on 25/06/2019 14:54:12:

I wondered if David George's difficulty was due to Alibre registering the PC, so refusing to work on a second computer - a copyright protection move. I recall seeing similar happen elsewhere.

NO Nigel - David had released his purchased licence from his Desktop computer (so he could use it on laptop). BUT the expired trial licence was still installed on laptop. Because the 6 month trial is a 'special' it is managed differently from a standard 30 day trial, it therefore requires some intervention to remove it after expiry (as explained in the article I linked to) - slightly annoying no doubt, but a small inconvenience in exchange for the 6 month trial period. After removing the trial licence, David should be able to use his permanent licence on the laptop, and he'll be able to switch the activation between computers as needed.

Please try not to spread confusion by speculating on matters that you don't have knowledge of. By all means ask if you'd like to know more about how licensing (or anything else) works.

For information - uninstalling Alibre leaves the licence file behind on the computer (that makes updates simpler). The server at the licensing provider also keeps a record of the computer ID. A 'User Profile' is also not removed by a normal uninstall - the actual program files themselves are removed by uninstalling.

25/06/2019 10:32:02

Answered in this article


Whether it was an extended trial, an ordinary trial or something else - the same /bat file will remove the local licence files which allows you to re-start the activation process.   If still having difficulties contact reseller or Alibre support.

Edited By David Jupp on 25/06/2019 10:36:07

Thread: Electronic Noise and ARDUINO
21/06/2019 14:53:45

Quite a bit of information around the internet regarding how critical the cable and how it is used can be for 1-wire. If not all sensors are working, that already suggests a problem. Noise on top of that won't help.

Thread: Learning CAD with Alibre Atom3D
15/06/2019 09:44:00

Another option (depends on the specific model) might be to add a chamfer to a straight edge to get an angled face - then use that to sketch on.

The key points are

  • You can only 2D sketch on planes, or on planar faces of existing solids.
  • You can add your own reference planes to help in creation of features.

Jason's method is very similar to how you might actually drill the holes - first set work up at desired angle, then drill.

The nice thing with CAD is that if the angle wasn't quite right, you can go back and change it without wrecking anything.

Thread: Is CAD for Me?
09/06/2019 13:59:59

Alibre is similar in approach to Fusion - though user interface and terminologies will differ in places.

Alibre is a 'Solids' modeller. It uses the ACIS geometry kernel (but user never 'sees' that), as do some other products. Most 3D CAD actually combines 'behind the scenes' technology components from more than one provider

Fusion has a lot in common with AutoCAD Inventor - and may even compete with it.

Whilst many 3D CAD packages share the same basic approach to modelling, there are exceptions. Some work very differently. One major division is between 'history based' and 'non-historic', another is Solids Modelling vs Surface Modelling. All have pros and cons.

If access to zero cost training is a prime consideration the options are either on-line videos and user forums, or choose a system that somebody you know already uses.

08/06/2019 18:13:15

Sometimes possible to get free (or very low cost) training in specific CAD packages - but tends to be funded by schemes linked to creating or protecting jobs, not really for hobbyists. It's usually the big name, expensive packages.

Universities/Colleges at least already have the computers and get very attractive deals on the software. If provided on a proper commercial basis the cost of training is likely to run into hundreds of pounds per person. Realistically a couple of full days is required to cover all the basics. Numbers in class best kept low so individual attention is possible (which doesn't help with cost per person).

08/06/2019 11:41:26


Alibre has several built in colour schemes, you can edit these and also set up you own custom colour schemes. I get that you aren't going to try again with Alibre, I just mention it for the benefit of others who may have restricted colour vision (or just don't like the standard choices).

Thread: Electricity Supply
08/06/2019 07:40:10

Surely you don't drive the car at peak power all the way to work ?

If you look at some of the 'fast charge' systems - the power ratings for those are very high, which limits where they can be installed.

Thread: Is CAD for Me?
07/06/2019 13:28:34

Nigel - if when taking the Alibre trial something got mis-typed, that could explain why I can't find you (this is in the master licensing system where everything ends up, regardless of where it originated).

If you should change your mind and want to have another go - PM me your trial code (if you took the extended trial), or the e-mail address that you used when activating the trial.

07/06/2019 11:43:46

Nigel - the PDF exercises for Alibre products are on the Alibre web site (Help & Learning area).

For Alibre Design

For Alibre Atom3D

I'm not able to find any record of a trial for you in the licensing system (searching by Nigel, or by Graham) - so am not able to renew or extend trial (PM me some details if you'd like me to search again).

05/06/2019 14:12:22


If the Mintronics web site doesn't display correctly for you, consider trying a different web browser.

As an alternative, I will happily provide e-mail address & phone number for Mintronics by PM if you wish - or get these from the Mintronics ad in the paper MEW.

05/06/2019 06:23:16

Nigel - your idea of how 3D CAD works seems to be driven by TurboCAD as far as I can tell. That is rather atypical when compared to many of the packages others have mentioned. I won't criticise TC as I know some people get on really well with it - a few other less well known packages have similarities with it

In most 3D CAD packages your bush could be produced from 2 concentric circles (or even 1) and an extrusion length. That's it, model done.

04/06/2019 15:51:47

That damned winky again ! Only noticed now it's too late to edit.

Edited By JasonB on 04/06/2019 16:08:35

04/06/2019 14:59:26

Quoting from Nigel above...

You can still assess fits etc. in orthographic drawings. It's correct shapes and dimensions that matter, not views!

You can - but not in a single click with clashes higlighted automatically. It's also easy in 3D to check for interference in multiple positions of a mechanism.


Converting a 3D model to the necessary 2D workshop drawings means advanced knowledge of your particular brand of software.

In most 3D CAD, to get from 3D model to 2D drawings takes just a few mouse clicks (hardly 'advanced'. Making sure all dimensions are arranged nicely and to preferred format can take much longer, I agree.


You can't though, work backwards, turning a multi-part orthographic drawing into an isometric assembly. CAD is not designed that way.

You can! It isn't preferred, nor best practice, but it's perfectly possible (except that assemblies are not isometric - views can be isometric). I will sometimes use this approach if someone has already created 2D CAD drawings, but a 3D model is needed for other purposes (though it can be faster in some cases to start again from scratch).


Don't worry Nigel - I know you won't be persuaded. There's nothing wrong at all with sticking to 2D should you prefer that.

The odd thing is that most 3D CAD modelling starts with 2D sketches anyway.




Edited By JasonB on 04/06/2019 16:08:13

04/06/2019 10:53:51

For an introduction to 3D CAD concepts, try MEW 217 as a starter.

Yes you can learn!

Being very familiar with 2D CAD can be as much of a barrier as a help when starting to use 3D CAD. The order of doing things is very different.

Edited By JasonB on 04/06/2019 16:06:11

Edited By JasonB on 04/06/2019 16:06:20

Thread: Hostaform, Nylon or Steel For Mini Mill Gear?
28/05/2019 19:44:46

Delrin & Hostaform are brand names for FAMILIES of resin. Within each there may be many different grades with tailored properties.

The article compares homopolymer actetal, vs copolymer acetal (without details of composition) vs Nylon 6. Plastics rapidly become fiendishly complex, even within a family. Don't expect a simple answer.

28/05/2019 19:05:49

This article might be a useful starter.

Thread: Denford Triac - Remove Easy Change Holder?
27/05/2019 17:21:41

This document from the Denford forum includes an illustrated parts list for Triac.

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