| https://www.eptac.com/faqs/ask-helena-leo/ask/75-barrel-fill-requirement-for-class-2-change-in-j-std-001-revision-f
75% Barrel Fill Requirement for Class 2 Change in J-STD-001 Revision F - EPTAC - Train. Work Smarter. Succeed Looking for solder training standards, manuals, kits, and more
| https://www.eptac.com/ask/75-barrel-fill-requirement-for-class-2-change-in-j-std-001-revision-f/
75% Barrel Fill Requirement for Class 2 Change in J-STD-001 Revision F - EPTAC - Train. Work Smarter. Succeed Looking for solder training standards, manuals, kits, and more
| https://www.eptac.com/soldertip/soldertip-37-through-hole-soldering-of-thick-pcbs/
. More than likely, there is not enough heat or thermal capacity in the solder iron to heat the entire hole up to soldering temperatures, thereby the solder solidifies going up through the hole and that’s it, it doesn’t fill any further
| https://www.eptac.com/faqs/soldertips/soldertip/soldertip-37-through-hole-soldering-of-thick-pcbs
. More than likely, there is not enough heat or thermal capacity in the solder iron to heat the entire hole up to soldering temperatures, thereby the solder solidifies going up through the hole and that’s it, it doesn’t fill any further
| https://www.eptac.com/ask/solder-flow-near-through-hole-component-body/
Solder Flow Near Through-Hole Component Body - EPTAC - Train. Work Smarter. Succeed Looking for solder training standards, manuals, kits, and more
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-mounting-hole-naming-convention-info_topic619_post3051.html
), just a clean hole through the FR4 material. But why? The plated hole drill bit hits copper on every hole. JZsori wrote: My understanding is that it is preferable to have a donut pad for the screw head so that the screw does not crush the epoxy glass material as much as it has a copper pad in between
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-mounting-hole-naming-convention-info_topic619_post3054.html
), just a clean hole through the FR4 material. But why? The plated hole drill bit hits copper on every hole. JZsori wrote: My understanding is that it is preferable to have a donut pad for the screw head so that the screw does not crush the epoxy glass material as much as it has a copper pad in between
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-mounting-hole-naming-convention-info_topic619_post3049.html
), just a clean hole through the FR4 material. But why? The plated hole drill bit hits copper on every hole. JZsori wrote: My understanding is that it is preferable to have a donut pad for the screw head so that the screw does not crush the epoxy glass material as much as it has a copper pad in between
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-mounting-hole-naming-convention-info_topic619_post3059.html
), just a clean hole through the FR4 material. But why? The plated hole drill bit hits copper on every hole. JZsori wrote: My understanding is that it is preferable to have a donut pad for the screw head so that the screw does not crush the epoxy glass material as much as it has a copper pad in between
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-mounting-hole-naming-convention-info_topic619_post3052.html
), just a clean hole through the FR4 material. But why? The plated hole drill bit hits copper on every hole. JZsori wrote: My understanding is that it is preferable to have a donut pad for the screw head so that the screw does not crush the epoxy glass material as much as it has a copper pad in between
