.PS
# Chuck.m4
gen_init s_init(Views) sinclude(tst.dim)
#
#################################################################
divert(-1)

                             `r_box(angle,pos,string)
                              Rotated text on a white background
                              (requires pstricks)'
define(`r_box',
 `ifpstricks(`M4tmp: ifelse(`$2',,Here,`$2')
  command sprintf("\rput{%g}(%g,%g){",`$1',crl(M4tmp.x),crl(M4tmp.y))
  f_box(`$3') at Orig
 command "}%"')')
define(`crl',`int(`($1)'/scale*1000000)/1000000')

                             `r_dimen(linespec,offset,label,tic offset,<->,pos)
                              dimension_ with rotated text on white background'
define(`r_dimen',
 `M4tmp: dimension_(`$1',`$2',,,`$4',`$5')
  r_box(rp_ang*rtod_,ifelse(`$6',,M4tmp+vec_(0,`$2'),`$6'),`$3')')

                             `ctrline(linespec,len)
                              Centerline'
define(`cdashl',0.1*scale)
define(`cgapl',0.03*scale)
define(`ctrline',`rpoint_(ifelse(`$1',,`to rvec_(linewid,0)',`$1'))
  define(`m4h',ifelse(`$2',,1*scale,`$2'))dnl
  m4n = int(rp_len/2/(m4h))*2+1
  for i=1 to m4n do {
    line to rvec_(rp_len/m4n/2-cdashl/2-cgapl,0)
    move to rvec_(cgapl,0); line to rvec_(cdashl,0); move to rvec_(cgapl,0)
    line thick dimensionth to rvec_(rp_len/m4n/2-cdashl/2-cgapl,0) } ')

                             `ctrarcr(pos,radius,startang,endang,len)
                              Arc cr centerline'
define(`ctrarcr',`dnl
  define(`m5h',ifelse(`$5',,1*scale,`$5'))dnl
  rp_len = abs((`$2')*(`$4'-(`$3')))
  m5n = int(rp_len/2/(m5h))*2+1
  m5a = (rp_len/m5n/2-cdashl/2-cgapl)/(`$2')
  m5s = cdashl/(`$2')
  m5sa = `$3'
  for m4irr=1 to m5n do {
    arc from `$1'+(rect_(`$2',m5sa)) to `$1'+(rect_(`$2',m5sa+m5a)) \
      with .c at `$1'
    m5sa = m5sa+m5a+cgapl/(`$2')
    arc from `$1'+(rect_(`$2',m5sa)) to `$1'+(rect_(`$2',m5sa+m5s)) \
      with .c at `$1'
    m5sa = m5sa+m5s+cgapl/(`$2')
    arc from `$1'+(rect_(`$2',m5sa)) to `$1'+(rect_(`$2',m5sa+m5a)) \
      with .c at `$1'
    m5sa = m5sa+m5a
    } ')

divert(0)dnl
#################################################################

scale = 25.4*2
tic = 3.6bp__

command "{\sf"

define(`visible_thick',`linethick_(visibleth)')
define(`hidden_thick',`linethick_(hiddenth)')
define(`dimension_thick',`linethick_(dimensionth)
  arrowwid = 1.5*arrowwid; arrowht = 1.5*arrowht; ')

d1 = 230
d2 = 204
d3 = 140

  visibleth = 1.2
  dimensionth = 0.4
  hiddenth = dimensionth

Orig: Here
visible_thick
  D3: circle diam d3 at Orig
  D2: circle diam d2 at Orig

  rr = d1/2
  r = 40
  h = 110/2
  thet = asin((h+r)/(rr+r))
  X1: rect_(rr,thet)
  P1: rect_(rr+r,thet)

dimension_thick
  cross(at (P1.x,-P1.y))
  cross(at (-P1.x,P1.y))

# Top outer visible line
visible_thick
# top arcs
  arc ccw from (-P1.x,h) to (-X1.x,X1.y) with .c at (-P1.x,P1.y)
  arc cw to X1 with .c at Orig
  arc ccw from X1 to (P1.x,h) with .c at P1
# right end
  line from (P1.x,h) to (305/2,h) then to (305/2,32/2) then left 40-3
  arc ccw rad 3
  line down 32-2*3
  arc ccw rad 3
dimension_thick {
  r_dimen(up 32 with .c at (305/2-5,0),0,32)
  arrow <- up 8 right 8 then right 4 from last arc.sw
  "3$\,$R" ljust
  r_dimen(up h*2 at (305/2,0),-10,110)
}; visible_thick
  line right 40-3 then to (305/2,-h) then to (P1.x,-h) 
# bottom arcs
  arc ccw to (X1.x,-X1.y) with .c at P1.x,-P1.y
  arc cw to (-X1.x,-X1.y) with .c at Orig
  arc ccw to (-P1.x,-h) with .c at (-P1.x,-P1.y)
# left end
  line from (-P1.x,-h) to (-305/2,-h) then to (-305/2,-25/2) then right 25
  down; arc ccw rad 3
  line right 40-25-2*3
  arc ccw rad 3
  line up 25
  {R: line invis down 10 at (2nd last line,last line) }
  arc ccw rad 3
  line left 40-25-2*3
  arc ccw rad 3
  line to (-305/2,25/2) then to (-305/2,h) then to (-P1.x,h)

dimension_thick
# centre
  ctrline(right 305-30 with .c at Orig,60)
  ctrline(up d1+10 with .c at Orig,)

  {BX: box invis ht 25+2*3 wid 40-25 rad 3 with .w at (-305/2+25,0)}
  Q: line invis from BX.n to BX.s; R: line invis from BX.se up 10 left 10
  X: Intersect_(Q,R)
  line <-> from BX.se to X then to (X.x,-X.y) then to BX.nw
  r_box(90,BX,```3$\,$R''')

# Drill centres
  D[1]: 35,sqrt(85^2-35^2)
  D[2]: -D[1].x,D[1].y
  D[3]: -D[1].x,-D[1].y
  D[4]: D[1].x,-D[1].y
  ctrline(from D[3] to D[1] chop 15)
  ctrline(to rvec_(2*15,0))
  ctrline(from D[3]+vec_(-15,0) to D[3]+vec_(15,0))
  ctrline(from D[2] to D[4] chop 15)
  ctrline(to rvec_(2*15,0))
  ctrline(from D[2]+vec_(-15,0) to D[2]+vec_(15,0))
visible_thick
  for i=1 to 4 do {
    circle diam 16 at D[i]
    for j = 0 to 7 do { arcr(D[i],23/2,j/8*twopi_,(j+3/4)/8*twopi_) ccw }
    }

hidden_thick
  for s=-1 to 1 by 2 do {
    line dashed from (-305/2,s*h) to (305/2,s*h)
    line dashed from (-305/2,s*30.6) to (305/2,s*30.6)
    line dashed from (-305/2,s*21.1) to (305/2,s*21.1)
#   line dashed from (-305/2+25+2,s*21.1) to (305/2,s*21.1)
    line dashed  dashwid/2 from (-305/2+25,s*25/2) down -s*(40/2-25/2-2);
    if s<0 then { arc dashed dashwid/4 ccw rad 2 } \
    else { up; arc dashed dashwid/4 cw rad 2 }
    line dashed to ((305/2,0),Here)
    for k = -1 to 1 by 2 do {
      move to (k*305/2,s*(30.6+10))
      { dashline(from Here+(0,s*9.5/2) right -k*16,,dashwid/2)
        dashline(right -k*9.5/2/2 up -s*9.5/2,,dashwid/3)
        dashline(left -k*9.5/2/2 up -s*9.5/2,,dashwid/3)
        dashline(left -k*16,,dashwid/2)
        dashline(from Here+(-k*16,0) up s*9.5,,dashwid/2.5) }
      { dashline(from Here+(0,s*11/2) right -k*36.5,,dashwid/2)
        dashline(right -k*11/2/2 up -s*11/2,,dashwid/3)
        dashline(left -k*11/2/2 up -s*11/2,,dashwid/3)
        dashline(left -k*36.5,,dashwid/2)
        dashline(from Here+(-k*36.5,0) up s*11,,dashwid/2.5) }
      { dashline(from Here+(0,s*13/2) right -k*32,,dashwid/2)
        dashline(down s*13,,dashwid/2)
        dashline(left -k*32,,dashwid/2) }
      ctrline(right -k*20 chop -3 chop 0); ctrline(right -k*20 chop 0 chop -3)
      }
    }

dimension_thick
# bottom
  dimension_(from (-305/2,-h) to (305/2,-h),-(rr*1.1-h),"305",20pt__)
# outer radii
  r_dimen(from (-P1.x,P1.y) down 40*cosd(30) right 40*sind(30),0,40,,->)
  r_dimen(from (P1.x,-P1.y)+(Rect_(40,120)) \
   down 40*cosd(30) right 40*sind(30),0,40,,<-)
# main diameter
  r_dimen(from (Rect_(rr,180+50)) to (Rect_(rr,50)),,230,,,(Rect_(50,50)))
# inner circles
  r_dimen(from (Rect_(d2/2,180+25)) to (Rect_(d2/2,25)),,204,,,(Rect_(25,25)))
  r_dimen(from (Rect_(d3/2,180-12)) to (Rect_(d3/2,-12)),,140,,,(Rect_(25,-12)))
  
# bolt hole placement diameter
  r_dimen(from Orig to (Rect_(85,-43)),,``85$\,$R'',,->,(Rect_(20,-43)))
# left slot
  r_dimen(from (-305/2+6,-25/2) up 25,0,25)
  r_dimen(from (-305/2,-26) right 40,0,40)
  line from last line.end to (last line.end.x,BX.s.y) chop -tic chop 0
  r_dimen(from (-305/2,26) right 25,0,25)
  line from last line.end to (last line.end.x,BX.n.y) chop -tic chop 0
# right slot
  r_dimen(from (305/2-40,-32/2-10) right 40,0,40)
  line from (305/2-40,-32/2) down 10+tic
# drill-holes
  for i=1 to 4 do {
    ctrarcr(Orig,85,atan2(D[i].y,D[i].x)-10*dtor_,atan2(D[i].y,D[i].x)+10*dtor_)
    }
  ctrarcr(Orig,85,atan2(D[4].y,D[4].x)+10*dtor_,atan2(D[4].y,D[4].x)+25*dtor_)
  ctrline(up 30 at D[3])
  ctrline(up 30 at D[4])
  r_dimen(from D[3]+(0,-14) right 35,0,35)
  r_dimen(from (0,D[3].y-14) right 35,0,35)

command "}%"
.PE