Talk:Factory/@comment-2A02:1811:CC1C:D700:8459:261C:B0E8:8E98-20191025001312/@comment-2605:E000:1218:C683:74D3:52FA:B9D2:414-20191112070425

"i can use the smelt slots from the comprehensives to smelt bars?" Yes

"does that mean there is no purpose to placing regular cutter/grinders?" Grinders Yes, Cutters No

Grinders have 6 Polish slots and Industrial Furnace has 10 Smelt slots. Replacing one of each with 2 Comprehensive Grinders yields 8 Polish and 12 Smelt slots which is +2 on both. So Comprehensive Grinders are better then having basic Grinders. Though you still will want some Industrial Furnaces as you end up smelting a ton of ore.

As for Cutters, since the Industrial cutter has 10 cutting slots, replacing one of each just changes 10 of each slot into 8 cutting and 12 smelting. Since the total slot number stays the same it isn't really and better or worse slot wise. Though the Comprehensive Cutters cost a bunch more to make then just using the Industrial machines.