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MECHANICAL LETTERING
LINE  WEIGHTS

Engineering Aid 3 - Beginning Structural engineering guide book
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45.839 Figure 3-58.-Leroy lettering set. standard  Leroy  lettering  set  consists  of  a set of templates, a scriber, and a set of pens. (See fig. 3-58. ) TEMPLATES Templates  are  made  of  laminated  plastic  with the characters engraved in the face so that the lines serve as guide grooves for the scriber. The height of  the  characters,  in  thousandths  of  an  inch,  is given by a number on the upper right-hand side of   the   template.   For   example,   3240-500CL indicates a No. 500 template. The entire number and  letter  designation  identifies  the  template in  the  manufacturer’s  catalog.  The  range  of character  heights  offered  by  a  standard  set  of templates is from 80 (0.08 in. or 5/64 in.) to 500 (0.5  in.  or  1/2  in.).  The  scale  at  the  bottom  of each template has the zero in the center and is arranged   for   proper   spacing   in   relation   to character heights. The distance between each scale division represents the center-to-center distance of  normal-width  letters. PENS A standard set of pens for producing various line weights consists of 11 sizes ranging from 000, the  finest,  to  8.  Each  pen  is  composed  of  two parts: the ink reservoir and the cleaning pin. The reservoir   is   a   series   of   connected   tubes   of decreasing  diameters,  the  smallest  establishing line thickness. The cleaning pin acts as a valve, protruding  beyond  the  edge  of  the  bottom  tube when the pen is not touching the drawing surface. In  this  position,  no  ink  flows.  When  the  pen  is resting on a drawing surface, the cleaning pin is pushed up, allowing a flow of ink. Action of the pin  in  the  tube  minimizes  ink  clogging. NOTE: As stated in chapter 2, some reservoir pens  are  made  so  the  point  section  will  fit  in  a Leroy  scriber.  They  have  become  popular  with  the SEABEEs  (and  widely  used  over  the  standard pens  contained  in  the  Leroy especially   for   long   hours   of lettering. A SCRIBER holds the pen in lettering  set), uninterrupted alignment  and controls  its  motion  as  the  tracing  pin  is  guided through  the  character  grooves  of  the  template. Two  types  of  scribes  are  available:  adjustable  and 45.120 Figure  3-59.-Leroy  scriber  and  template. 3-38







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