By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

TurboCAD Explode/Create Fragmentation?

Problems after Creating & Exploding Groups

All Topics | Latest Posts

Search for:  in Thread Title in  
IanT10/03/2015 10:34:09
1945 forum posts
194 photos

I've recently been collaborating with some colleagues in Gauge '3' to produce a low-cost battery electric model of a 100HP Sentinel that we hope to make available in small numbers to interested parties as a "starter" engine. My part was to do the drawings and design the basic mechanicals (e.g. the easy bit!).

I've used TurboCAD for many years but my needs are generally pretty straight forward and I've never had any problems that didn't turn out to be my fault. With the Sentinel - many revisions were necessary as we discovered more details about the originals and made various design decisions and changes.

I was routinely creating 'groups' in order to assemble them but often had to 'explode' them to make changes afterwards. I discovered that my circles and arcs didn't "re-assemble" - they had been fragmented into many smaller arcs.

This gave me various problems - for instance with finding centres for 'snapping to' . I managed to generally overcome this by creating key background centre references (in another layer) but it was tiresome.

Talking to Malcolm High (of Model Engineers Laser) recently, I mentioned this in relation to exporting a DXF for laser cut parts and he told me it was a problem with TC that he saw regularly - as the laser cutter obviously couldn't manage all the little arcs which should have been a circle....

Can anyone advise whether TC is fundamentally flawed in this respect (and whether there is a fix) or if I am using the tool in the wrong way (and therefore creating my own problem). I am currently using TC Deluxe V15.



IanT10/03/2015 10:40:00
1945 forum posts
194 photos

g3 agm 2015 033.jpg


In case anyone is interested - here is the prototype engine shown at the G3 AGM in February. Still work to do but coming along..



g3 agm 2015 031.jpg

Edited By IanT on 10/03/2015 10:40:41

John Stevenson10/03/2015 10:49:19
5068 forum posts
3 photos


I think you will have better luck asking here.


Roger Vane10/03/2015 10:50:27
100 forum posts
18 photos

Hi Ian

I've spotted this problem from time to time with both TC 6 Pro and TC 20 DL.

Certainly one cause appears to be 'over-exploding', where you actually explode the entity itself into smaller segments. You will probably need to select and explode twice - all too easy to do when you're paying attention to the design itself. Suggest you draw a circle and try it. You can then re-group them back into the single entity.

There may be other causes that I'm not aware of, but the above is certainly one problem.

All the best, Roger

Gary Wooding10/03/2015 13:44:26
932 forum posts
236 photos

I think Roger is correct - you exploded too many times. I just tried combining several circles into a group, then exploding the group, and the circles remained as circles (the Selection Pallet reports them as circles). If I explode them again, Selection Pallet reports them as Polylines and they are, indeed, lots of little arcs or lines.

IanT10/03/2015 17:17:51
1945 forum posts
194 photos


Thank you for the feedback. I will experiment a little and see if I can find a way to "under" explode my drawings - or perhaps delay any grouping action and thereby minimise the risks of this occurring....

Part of the problem may have been that (in this case) I had built up quite a few small groups as I went along (modifying & changing various assemblies as I went) - and it does seem quite hard to then 'ungroup' in an orderly fashion without this fragmentation effect.

Possibly a potential weakness in TC, combined with poor process on my part, resulting in a problem



Neil Wyatt10/03/2015 18:30:54
18895 forum posts
734 photos
80 articles

I can't find an 'object manager' in Turbocad, such a thing* would make grouping and ungrouping easy.


*Its a window that lists all the elements of a drawing in groups and in order of what's at the front (I can imagine this doesn't work in 3D as the 'front' is subjective...)

IanT10/03/2015 20:14:09
1945 forum posts
194 photos

Not a feature in the DL version as far as I know Neil - it maybe available in the (more expensive) Pro version.

I'll also do as JS suggests and go and ask the TC Forum (yet another Forum to join!) and see if they have any useful advice on the subject.

Thanks everyone.


All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
JD Metals
Eccentric July 5 2018
rapid Direct
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest