Barrel Heaters - Hasmak.com.tr

W A T L O W<strong>Barrel</strong> <strong>Heaters</strong>Problem SolversWatlow Solutions To Common<strong>Barrel</strong> Heater ProblemsTorque Details for <strong>Barrel</strong>Heater ScrewsIf barrel heater clamp screws aresnapping off during maintenance,screws are being tightened beyondtheir limits. Please reference chartto the right for installationinformation.MI, THINBAND and Mica Clamp Torque ChartNickel Nickel Black Black OxidePlated, Dry Plated, Anti- Oxide, Dry Anti-SeizeStandard SeizeClamp Screw Size Torque (in.-lb) Torque (in.-lb) Torque (in.-lb) Torque (in.-lb)UNC #6-32 30 20 20 15UNC #8-32 40 30 25 20UNC #10-24 55 35 35 30UNC 1/4-20 80 55 50 45UNC 1/4-20 w/springs 40 40 N/A N/AM6-1 80 55 50 45M5-0.8 60 40 35 35Injection Molding<strong>Barrel</strong> <strong>Heaters</strong>Problem<strong>Heaters</strong> glow red on startupbefore reaching barrel set point.Heater Solution1. Wiring Considerations:• If heaters are dual voltage, check wiring to ensure that heater halvesare wired in series for higher voltage installation.• Check in<strong>com</strong>ing voltage for over voltage condition.2. Installation Considerations:• Since most heaters transfer heat through conduction, it is essential thatheaters fit tightly to the machine barrel. Check installation instructions toensure that heaters are clamped to torque values indicated. See MI,THINBAND and Mica Clamp Torque Chart above:• Ensure that dirt and grit are removed prior to installation. Any foreignmatter under the heater will interfere with proper heat conduction.3. Thermal Considerations:• Review application and clamping graphs to ensure heater watt densityis not excessive.• Examine machine to evaluate thermal mass in a particular zone. Highthermal mass can conduct heat away from zone being heated, drivingup heater temperature as heater expands away from barrel.59