Hi Brendan,

I presume you are doing this in DMIS. You are getting the "Not enough construction members" because the CONST/CYLNDR command is expecting at least 6 point features.

You can construct a cylinder from 2 circles by using a technique which accesses the touch data of each circle measurement. You should have received a handout last week describing this but here it is in case you've mislaid it.

CONST/CYLNDR,F(CY0),BF,FA(CR0)[0,2],FA(CR1)[0,2]

This causes the CONST command to use points 0-2 from Circle CR0 and 0-2 from CR1 to get 6 points for a cylinder.

Note, the LK implementation is wrong at present, the command should read FA(CR0)[1,3]. this will be corrected in a future release.

For further information consult section 3.2.6 (pages 14/15) of the DMIS V3.0 spec.

Regards,

Keith Morton
DMIS Technical Support