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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: Alibre Atom 3D pdf manual free to MEW readers
24/05/2019 14:48:05

The offer of the PDF version at no charge was only sent to those in UK who had registered the MEW 6 month extended trial of Atom3D (which should have limited it to those who had purchased the magazines).

If you didn't receive and believe you should have, I suggest that you take that up with Mintronics.

Edited By David Jupp on 24/05/2019 15:04:50

24/05/2019 13:32:35

Sometimes browsers can chop off the file extension (or even change it) on download.

Are you sure that file extension isn't just hidden (this is default in Win10) ?

Do you have something installed that can read PDF files? Win10 by default will try to use Microsoft Reader or Edge. What software is set to be default for PDF files? Maybe install the free Adobe Reader.

Thread: Learning CAD with Alibre Atom3D
11/05/2019 07:38:47

Off-line activation (without direct internet connection) is only available for Alibre Design, not for Atom3D - there is also an additional charge for enabling off-line activation.

The internet connection is only required for activation of Atom3D, then approximately once a month for licence verification - it is not necessary in routine use.

Some users provide a temporary internet connection (for example by mobile phone) to a PC that otherwise doesn't have a connection, just to allow activation and licence verification.

Licensing policy is set centrally by Alibre, LLC.

I'm sure you will find Gordon at BayCAD helpful - any feedback or special requests regarding licensing should be made via your reseller.

Thread: Threading 1/8 stainless steel
01/05/2019 15:44:05

1/8" (3.175mm) is at the maximum of major diameter for a 5BA male thread, according to BS93. That is before any oversize tolerance of the rod, or any extrusion of metal when cutting the thread (which is quite likely with tough materials).

I can see why Simon mentioned turning down the diameter as a first step.

Thread: Learning CAD with Alibre Atom3D
09/04/2019 16:45:24

Colin,

A couple of answers - you may well be contacted by Alibre or your local reseller as you near the end of the extended trial. If for any reason that doesn't happen, you'll actually get a message on screen at end of trial reminding you contact them. Obviously this is in the hope that you'll wish to purchase a licence to continue using the software.

Should you not wish to purchase a licence, or if you simply aren't ready to do so yet - please read on. I had previously reported that at end of trial period, the software will revert to 'viewer mode'. Due to some alterations in how the extended trial is managed at the licensing server, the behaviour has changed slightly. It is possible to access 'viewer mode' after the trial expires, but that does now require a small effort. This new article on the Alibre web site explains how to remove the extended trial licence and access viewer mode.

28/03/2019 14:47:38

John - once you have decided upon your preferred dimension styles, consider making your own custom template for 2D drawings. 2D drawing properties (including available dimension styles) are inherited from the template used, the supplied templates are read only to prevent overwriting, but you can make your own custom templates. See this video for a quick overview, or this article for more details. Both were created for Alibre Design, but the basics are the same for Atom3D.

Edited By David Jupp on 28/03/2019 14:54:31

Thread: Motor control circuit
28/03/2019 10:33:09

The VFD can provide many of the functions of a contactor (overload and no-volt release) if configured appropriately - note it is possible to configure in ways that would not provide these expected protections.

Does your VFD include STO functionality? If it does (and if the STO circuit is wired correctly) that may well satisfy even requirements for safe working on the machine.

Provision of a manual isolator switch, or removable plug for the supply to VFD would be sensible.

Thread: Learning CAD with Alibre Atom3D
21/03/2019 06:06:10

Neil - that is an old collection of 'dumb solid' models (most on-line catalogues offer dumb solids). You can apply additional features on top of the imported file - so adding keyways, cutting thinner, extruding thicker (use project to sketch for the outline) are all possible. Alibre Design Expert does have 'direct editing' tools - they largely make things easier / quicker, you can make most changes in Atom3D with a bit more work.

I like the Alibre part library if I'm in a hurry, as there aren't hundreds of categories to search through.

Thread: Conundrum for the collective!
20/03/2019 19:28:55

Is DIN 225 coupling even a real thing? Could it be DN (Nominal Diameter) ? That designation is widely used in piping (which as we've seen uses flanges).

These days most standards are harmonised across Europe - so what is BS EN ISO xxxx in UK is DIN EN ISO xxxx in Germany. Relatively few purely National standards are left - though there are some.

I did a quick search on the BSOL site under Marine Drive - 50 pages of results.... , tried Marine Flange - just piping. Any more suggestions for what they might be called ? Is this main propulsion, or something else?

Can you tell us the manufacturer, or are you trying to make the quiz especially difficult?

Marine stuff could even have a specific Lloyds Register classification...

20/03/2019 14:06:47

What is the gearbox for? A lot of standard are industry specific. For example DIN(also BS) EN ISO 9409 is from the Robotics/Automation industry - but it doesn't match your dimensions.

Much easier to search for standards if you have some idea of the title, or at least a few words.

Thread: Learning CAD with Alibre Atom3D
20/03/2019 08:27:50

Steve,

Mechanism for joining any parts together is assembly constraints - bolts are just additional parts in the assembly.

If you want quick way to get hold of bolts/screws for your design, take a look here and choose Mechanical Hardware as the category.  It isn't comprehensive, but it can be quite handy.

Edited By David Jupp on 20/03/2019 08:34:23

19/03/2019 16:36:46

Neil - that would normally give a 'self intersection' error - basically the part of the profile on the inside of the curve reverses direction of movement as it moves along the path, due to the too sharp curvature of the path.

19/03/2019 07:37:21

Colin,

Jason started his sweep path that the origin by the look of it, and drew his profile (circle) on one of the principal planes that intersects the origin.

The sweep path must at least reach, or can pass through, the plane on which the profile is sketched.

As Jason said - the path sketch can be open (the warning about this is a standard thing, most sketches do have to be closed, but there are a few exceptions).

Is any error or status message displayed for the attempted sweep?

18/03/2019 19:58:00

Or produce the solid, then apply a Shell command to hollow it out (removing both end faces).

15/03/2019 11:21:40

Ah yes - Jason has it, I keep forgetting that the simplified interface for Atom3D does a few things differently from Alibre Design.

Edited By David Jupp on 15/03/2019 11:22:10

Edited By Neil Wyatt on 01/05/2019 13:54:46

15/03/2019 11:10:33

Circle disappearing - you may have 'sketch visibility' toggled off. There's a button for that on the Viewing & Analysis tab of the Ribbon, or try key combination Ctrl+Shift+K to toggle it. Sketch visibility is not required to be on, it's a preference choice.

Enter box greyed out for Extrude dialogue - some key information is missing - is the 'Sketch' field populated? If not clik in it, then click on the sketch to be used (in Design Explorer).

Edited By Neil Wyatt on 01/05/2019 13:54:57

Thread: combined BOB with drivers or seperate?
14/03/2019 09:53:49

Integrated board will be smaller and cheaper than using separate driver modules, but if you manage to blow a driver you can't just swap it out as easily as with separate units. Less wiring to do with an integrated board. Less choice of driver current ratings etc. with an integrated board, you get what the board maker gives you.

I've used integrated parallel breakout boards in the past without problems, but I wasn't pushing the drivers hard.

Thread: Learning CAD with Alibre Atom3D
14/03/2019 09:34:12

I'd say that there is significant benefit of using something like Atom3D even if you only want 2D drawings - it's often faster than a pure 2D approach once you get the hang of things, especially if you need cross section views, enlarged detail views, isometrics etc. Also when the design evolves/changes, the 2D drawings update automatically.

The vast majority of commercial users of Alibre produce 2D drawings for manufacture of their designs.

13/03/2019 15:29:05

Nigel - it MIGHT be practicable to use work done in TC as a basis for Atom3D files. From you comments I believe that all your previous work is in 2D - this could probably be exported as DXF or DWG (I've never used TC), then imported into Atom3D and used to generate sketch profiles for 3D work. This video covers the basic method - the video shows Alibre Design rather than Atom3D, but the process would work in the same way. It can sometimes be quicker and simpler to just start over though - all depends on the individual case.

I did write a short article on the basics of 3D CAD for MEW some while back (not sure which issue) - this thread would get a bit long if I repeated that here. At the very basic level, 3D CAD moves 2D profiles through 3D space to define 3D features. A feature can either add material to or subtract material from the model. The movement of a profile might be along a straight line, in a circle, or some more complex path.

Building simple features one upon another allows complex parts to be modelled - in some ways it's similar to fabricating a real world part - joining 'lumps' together and cutting / drilling / filing material away. Forget the 'drawings' until later in the process - though having ran courses, I know that some people struggle to change their workflow.

As for the mathematical accuracy of joining trimming - yes profiles have to be 'closed' for most operations, but at least the software analyses this and can point out where the problems are. Lots of problems start because users create one complex sketch (like a finished 2D drawing), where a number simpler ones spread over several features would be much easier to create, and to edit if changes are needed afterwards.

13/03/2019 07:23:39

The workshop drawings drop out with very little effort once you have done the 3D model - with even section views generated in seconds, all based on the 3D model. The really good bit is that if you change the model, the drawings update to reflect the changes.

Each to his own. Not everyone will get on with the software, hopefully many will - even if only to get a better idea of whether 3D CAD is something they wish to take forward.

It was precisely the 'slow learning curve' problem that led to the 6 month extended trial for MEW readers. Many in the past has felt that 15-30 days trial just wasn't long enough to properly evaluate the software.

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