Measured Head Spacing 20060725 ------------------------------ Qualstar head | Magnusonic Combo 7/9 track head | IBM 3480 MR | | | 7 trk 9 trk | | | .0400/.0150 | .0400/.0300 .0400/.0150 | | | -.0130 .0075 | .1107 .0108 | | | -.0055 .0402 | .1215 .0395 | 9 .0347 | .1610 | .0149 | .0155 | .0496 .0400 | .1765 .0395 | 8 .0896 | .1128 .0197 .2160 | .0148 | .0156 | .1044 .0401 | .1325 .0403 .2316 .0398 | 7 .1445 |7 .1728 .2714 | .0153 | .0302 .0150 | .1598 .0402 | .2030 .0400 .2864 .0395 | 6 .2000 |6 .2430 .3259 | .0151 | .0292 .0155 | .2151 .0402 | .2722 .0403 .3414 .0398 | 5 .2553 |5 .3125 .3812 | .0147 | .0300 .0153 | .2700 .0396 | .3425 .0401 .3965 .0399 | 4 .3096 |4 .3826 .4364 | .0150 | .0295 .0148 | .3246 .0400 | .4121 .0407 .4512 .0398 | .4266 .213 3 .3647 |3 .4528 .4910 |3 .4479 .0152 | .0328 .0153 | .035 .3799 .0400 | .4856 .0372 .5063 .0398 | .4514 .213 2 .4199 |2 .5228 .5461 |2 .4727 .0152 | .0288 .0154 | .034 .4351 .0404 | .5516 .0406 .5615 .0395 | .4761 .214 1 .4755 |1 .5922 .6010 |1 .4975 <--- bottom edge of tk1 | | | | .0057 | .0150 .0060 | .5037 .4812 | .6072 .6070 | .5126 second gutter .5471 | .6700 .6696 | .5220 | | .5312 first gutter .8527 .8485 | | .6500 edge of ferrite | | .9800 | .9743 .9740 | .8702 <--- bottom of head stack Notes: Q1052 base to lower edge of tape .4988" (bottom of head to start of gutter on orig 1052 head) 3480 heads have two gutters at the edge, both inside the .5" tape width X3.180 ------ track tolerance +/- .0016" track width .021" X3.39 ----- track tolerance +/- .003" track write width .043" min .029 centerline tk1 to edge Pertec Track Widths ------------------- 7 trk .048" write .032" read .040" edge to trk 0 centerline 9 trk .044: write .040" read .029" edge to trk 1 centerline Calculated Track Spacings From Standards ---------------------------------------- .5" <--- .0287 - 18 .0210 .4598 .4503 - .0038 - 17 .0210 .4350 .4255 - .0038 - 16 .0210 .4102 .4007 - .0038 - 15 .0210 .3854 .3759 - .0038 - 14 .0210 .3606 .3511 - .0038 - 13 .0210 .3358 .3263 - .0038 - 12 .0210 .3110 .3015 - .0038 - 11 .0210 .2862 .2767 - .0038 . - 10 .0210 .2614 .2519 .5" <--- - .010 .0038 . - - 9 .040 .469 9 .0210 .2366 .2271 - - .015 .0038 . - - 8 .040 .414 8 .0210 .2118 .2023 .5" <--- - - .020 .015 .0038 . - - - 7 .040 .460 7 .040 .359 7 .0210 .1870 .1775 - - - .030 .015 .0038 . - - - 6 .040 .390 6 .040 .304 6 .0210 .1622 .1527 - - - .030 .015 .0038 .1317 - - - 5 .040 .320 5 .040 .249 5 .0210 .1374 .1279 - - - .030 .015 .0038 .1069 - - - 4 .040 .250 4 .040 .194 4 .0210 .1126 .1031 - - - .030 .015 .0038 .0821 - - - 3 .040 .180 3 .040 .139 3 .0210 .0878 .0783 - - - .030 .015 .0038 .0573 - - - 2 .040 .110 2 .040 .084 2 .0210 .0630 .0535 - - - .030 .015 .0038 .0497 - - - 1 .040 .040 1 .040 .029 1 .0210 .0382 .0287 - - - .020 .010 .0287 --- --- --- ^ ^ ^ trk centerline trk centerline trk centerline .040 x 7 .280 .040 x 9 .360 .0210 x 18 .3780 .030 x 6 .180 .015 x 8 .120 .0038 x 17 .0646 .020 x 2 .040 .010 x 2 .020 .0287 x 2 .0574 ---- ---- ----- .500 .500 .5000