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
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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/topic619.html
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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/topic619&OB=ASC.html
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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_post3055.html
JZsori Report Post Thanks(0) Quote Reply Posted: 13 Feb 2013 at 3:28pm 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
| http://etasmt.com/cc?ID=te_news_industry,26961&url=_print
. And our epoxy resin and BT are all organic materials. 2. Inorganic materials: ① Aluminum substrate: The aluminum substrate is a metal-based copper clad laminate with good heat dissipation function
Imagineering, Inc. | https://www.pcbnet.com/blog/selecting-pcb-materials-for-fabrication/
– Laminates consist of prepregs and foils that have been laminated and cured together with heat and glass. These can be made out of a variety of thicknesses and different types of epoxy and glass waves. Solder Mask
.gif)
