hidden hit counter


HOME

 

FORUM ARCHIVE

 

CAD PLANS

 

TECH FEATURES

 

ADMIN 1

 

ADMIN 2



Top The TRMA Discussion Forum topic #48274
View in linear mode

Subject: "RE: 3D Printing" Previous topic | Next topic
Bill WestSat Jul-15-17 01:45 AM
Member since Feb 02nd 2010
478 posts
Click to send email to this author Click to send private message to this author Click to view this author's profile Click to add this author to your buddy list
#55345, "RE: 3D Printing"
In response to In response to 43


          

Hi Steve
Well well well, we're off into another sphere. Very nice looking.

About scale, I take it you have usually done your 3D work with "real" dimensions and your 3D printing with objects suitable for printing "full size". Scales always mean what does a given distance on the drawing represent on the real object. To work with them however I think the key thing is to simplify the statement of the scale, or at least do it temporarily:
-get the fractions out, IE for 1/8"=1' think 1"=8'
-get the units the same on each side, IE for 1"=8' think 1"=96".
Then the ratio is obviously 1 part to 96 parts or 1:96. You can now measure on the plan and directly multiply it by 96 to find the distance on the real object. In reverse you can take a dimension on the real object, divide it by 96 and get the distance that it should be on the plan.

With the ratio found you don't even need units any more. 1"=96" is exactly the same scale as 1'=96' or even 1 centimeter=96 centimeters. This leads to stating model scales as 1:96, 1:350 or 1:144. 1:350 is simply 1 unit on the plan or model represents 350 of the same units on the real object.

In going from subject to model one chooses a scale to reduce the real object to a workable size and tries to pick a popular ratio while doing this. Our 850' Titanic needs to come down to something between 1' and 6' to be feasible as a desktop model. That quickly leads to wanting a scale between 850'/1' =1:850 and 850'/6' =1:141.6. A quick look at the popular ship hobby scales brings up 1:700, 1:350 and 1:144 as possibilities. The model railroad scales of 1:87 (HO scale) or 1:48 ("O" scale) would clearly be too big. To put your 60 odd foot long engine on a one foot clipboard you need a scale around 1:60 or 1"=5'. That happens to be the unusual scale that poster Atlantic Run is using for his live steam engine model.

Scales have frequently involved something that is easy on a ruler, hence the likes of 1"=1' or 1/8"=1'. In Imperial measure this puts in the inches to a foot factor of 12 and gives odd ratios. It works well in making the drawings in an inches and feet based drawing office but is not as simple as doing work in metric where the ratios are always nice round numbers. With a North American upbringing, when I lay my Imperial ruler on an H&W 1/8"=1" plan I automatically read 3/8" as being a 3' frame spacing and the intermediate 1/16" and 1/32" marks as being 1/2' and 1/4'.

Wikipedia has some articles listing the popular model scales.

Bill

  

Alert | IP Printer-friendly copy | Reply | Reply with quote

3D Printing [View all] , monkey95, Tue Dec-11-12 04:34 PM
  RE: 3D Printing, endare, Dec 11th 2012, #1
RE: 3D Printing, monkey95, Dec 12th 2012, #2
      RE: 3D Printing, Roy Mengot, Dec 12th 2012, #3
           RE: 3D Printing, William W. Young, Dec 12th 2012, #4
           RE: 3D Printing, ChrisCMR, Dec 12th 2012, #5
                RE: 3D Printing, endare, Dec 13th 2012, #6
                     RE: 3D Printing, monkey95, Dec 13th 2012, #7
                          RE: 3D Printing, bpread, Dec 13th 2012, #8
                               RE: 3D Printing, Scott Andrews, Dec 13th 2012, #9
                               RE: 3D Printing, endare, Dec 14th 2012, #12
                                    RE: 3D Printing, Jason, Dec 14th 2012, #13
                                    RE: 3D Printing, monkey95, Dec 14th 2012, #14
                                         RE: 3D Printing, Jason, Dec 14th 2012, #15
                                    RE: 3D Printing, Scott Andrews, Dec 18th 2012, #16
                                         RE: 3D Printing, endare, Dec 19th 2012, #17
                                              Very nice! (nm), Scott Andrews, Dec 20th 2012, #18
                                              RE: 3D Printing, monkey95, Dec 21st 2012, #19
                                              RE: 3D Printing, ChrisCMR, Dec 21st 2012, #20
                                              RE: 3D Printing, ChrisCMR, Dec 22nd 2012, #21
                                              RE: 3D Printing, endare, Dec 22nd 2012, #22
                                              RE: 3D Printing, ChrisCMR, Jan 29th 2013, #24
                               RE: 3D Printing, Roy Mengot, Dec 13th 2012, #10
                               RE: 3D Printing, monkey95, Dec 13th 2012, #11
                                    RE: 3D Printing, mjs28c, Jan 02nd 2013, #23
                                         RE: 3D Printing, Jason, Jan 31st 2013, #25
                                              3D Printing 1/100 Lifeboat, endare, May 20th 2015, #26
                                                   RE: 3D Printing 1/100 Lifeboat, titanicinfoseeker, May 20th 2015, #27
                                                        RE: 3D Printing, tmgarmon, Jun 02nd 2015, #28
                                                             RE: 3D Printing, William W. Young, Jun 25th 2016, #30
                                                                  3D Printed Propellers, endare, Jun 28th 2016, #31
                                                                       RE: 3D Printed Propellers, William W. Young, Jun 28th 2016, #32
                                                                            RE: 3D Printed Propellers, Josemar, Jun 29th 2016, #33
                                                                                 RE: 3D Printed Propellers, endare, Jun 29th 2016, #34
                                                                                      RE: 3D Printed Propellers, William W. Young, Jul 01st 2016, #35
                                                                                      RE: 3D Printed Propellers, Nightstriker, Mar 08th 2017, #36
                                                                                      RE: 3D Printed Propellers, endare, Mar 09th 2017, #37
                                                                                      RE: 3D Printed Propellers, Zenoms, Mar 09th 2017, #38
                                                                                      RE: 3D Printed Propellers, endare, Mar 10th 2017, #39
                                                                                      RE: 3D Printed Propellers, Zenoms, Mar 10th 2017, #41
                                                                                      RE: 3D Printed Propellers, Nightstriker, Mar 10th 2017, #40
                                                                                      RE: 3D Printed Propellers, Nightstriker, Jul 14th 2017, #42
                               RE: 3D Printing, SteveFury, Jul 14th 2017, #43
                                    RE: 3D Printing, Bill West, Jul 15th 2017 #44
                                         RE: 3D Printing, endare, Jul 19th 2017, #45
RE: 3D Printing, Plutralias, Jun 23rd 2016, #29

Top The TRMA Discussion Forum topic #48274 Previous topic | Next topic


Titanic artwork at top of page is owned and copyright of Stuart Williamson and is used with permission.