Article · Tool Modifications
Coolant Grooves: Through-Spindle Cooling Without Through-Tool Holes
A lower-cost way to get coolant to the cut: ground grooves route through-spindle coolant around the outside of the tool. Add -CG to any RobbJack end mill part number.
Cooling issues at the cut don't always justify a through-coolant tool. RobbJack can add coolant grooves to your favorite end mill — every cutting tool can be customized for your specific application to help you work better, faster, and more efficiently — giving you through-spindle cooling at a fraction of the cost of drilled coolant holes.
What coolant grooves do
Coolant grooves are channels ground into the tool that let coolant flow around the outside of the body for through-spindle coolant applications. They direct coolant down to the cutting zone to flush chips and pull heat out of the cut — the benefit that drives tool life and finish — without the cost of drilling coolant passages through the tool itself.
When to choose grooves over through-tool holes
Through-the-tool coolant holes are the premium option, but they add cost and aren't available on every geometry. Coolant grooves are the lower-cost path to better cooling on a standard tool — ideal when you already have through-spindle coolant at the machine and want to get it to the cut without stepping up to a fully ported tool.
How to order
Coolant grooves are a standard modification on RobbJack end mills. Order by taking the existing part number and adding the -CG suffix — for example, an A1-201-12 with coolant grooves becomes A1-201-12-CG. See the price sheet for modification pricing, or request a quote and RobbJack's team will spec it for your application.
If you've got through-spindle coolant but not a through-tool cutter, coolant grooves are the inexpensive bridge — same part number, plus -CG.
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