Vacuum Clamp Analysis

Vacuum Clamp Assembly A system that creates negative pressure to hold down work pieces during machining Will allow for easy set up by user Work pieces will be held down after being cut Collect debris being cut from board Corrects for board warpage

Vacuum Clamp- Shopvac vs Pump Shopvac + More affordable + Very high flow rate(150+ cfm) + Could share vacuum with debris management system. + Allows for leaks in system + Also acts as a debris management system - High noise level Vacuum Pump + Quieter than shopvac - Can be expensive - Very low flow rate(~10 cfm) - Could not have any leaks in system - Could not allow debris to reach vacuum pump

Vacuum clamp calculations About 2.5 lbf is supplied from each hole. In a feasibility test, our prototype had 16 holes. A total of 40 lbf was applied to the PCB.

Registration System on Vacuum Clamp Assembly Process 1.PCB is secured to vacuum table 2.A number 57 bit (42 mil) is inserted into the mill and can drill holes the size of a push pin 3.Drill alignment holes for reference pins 4.Stop the mill and insert pins through holes into sacrificial layer 5.Mill one side, flip the board over, and re-pin ● Particularly important for zeroing a double sided PCB board ● Ability to hold the board more securely and flip the board halfway through ○ Pins help restrict translational degrees of freedom and z-axis rotation and allow for realignment when flipping the board over ● Pin holes can be incorporated into the PCB design ● At least 2 pins needed, possibly up to 4