Frequently Asked Questions

“What’s the difference between a single nozzle and dual nozzle system?”

Each SPIDERCOOL servo nozzle assembly is programmable through a 90 degree range.  A dual nozzle system includes two individual programmable nozzles that target the tools from opposing directions.  Each nozzle can be programmed individually and independently of the other.  This means that the nozzles can be aimed at either the same point or different fixed points on the tool, and that either or both nozzles can be set to an oscillating sweep cycle.

Single nozzle systems are identical to a dual nozzle except there is only one servo nozzle assembly instead of two.  For each tool, the nozzle will memorize a precise fixed coolant position, or an oscillating sweep cycle.

“Which should I get, a single nozzle or dual nozzle system?”

Granted, we may be slightly biased on this, but in our opinion two is always better than one.   Dual nozzle systems are more versatile and deliver higher performance because you have two individual programmable nozzles that come from opposing directions.  Keep in mind the cost of a dual nozzle system is only 50% greater than a single, for double the performance.

But do you really need two?  A single nozzle may be perfectly suitable if you are doing mainly three axis work using smaller cutters with fairly light cutter engagement.  Whenever 4th or 5th axis work, complex fixturing, and/or heavier, deeper cutting is involved, we strongly recommend dual nozzles.  The workpiece constantly rotating to different orientations can obstruct the coolant stream from one nozzle while providing a clear path for the other.  The same can be true for complex fixturing or milling around the perimeter of a part.  Dual nozzles address these situations perfectly, and are even more effective at chip evacuation from drills, endmills, pockets, etc.

“Can I upgrade from a single nozzle to a dual nozzle at a later date?”

Absolutely, yes you can.  It is entirely possible to add a second nozzle at a later date.  The SPIDERCOOL Robodrill mechanical assembly ships ready to accept either one or two nozzles and it is nice to know you have this option.  However, if you feel you may want a dual in the future, we strongly advise you to consider ordering a dual up front.  Reason being, adding the second nozzle after the whole system is covered in coolant, oil and chips is a messy job!

“How do you program SPIDERCOOL?”


Actually no programming is necessary and “teach” is a more accurate term.  The machinist teaches SPIDERCOOL by turning the adjustment knob to precisely aim the coolant stream. This is done only once for each tool in the machine. From that point on, coolant adjustment is automatic.  Adjustments can be made and re-memorized at any time during the machining cycle.

“How does SPIDERCOOL know which tool is in the spindle?”


When the tool change occurs after executing M6, the number of the tool in the spindle is transmitted through the Fanuc’s internal serial port directly to the SPIDERCOOL control board.  A very simple macro program is created to accomplish this.  Some older Robodrill machines require the use of an alternate M code such as M140.

“Does SPIDERCOOL replace the coolant pump?”



No.  SPIDERCOOL works in conjunction with the Robodrill’s existing flood coolant pump.  SPIDERCOOL automates the aiming process and increases the performance of the coolant by condensing and precisely delivering it to the sweet spot of each cutter.

“Will SPIDERCOOL increase the coolant pressure?”

In nearly all cases on the Fanuc Robodrill, the answer is yes.  Coolant pressure and flow rate are inter-related functions of the pump, associated plumbing, kinematic viscosity of the fluid, and size of the outlet orifice.  The Robodrill factory coolant system delivers the available coolant through four large diameter Loc-Lines located directly behind the spindle.  This approach does not deliver more coolant to the cutting edge of each tool.  Instead those nozzles are usually staggered to aim at different length tools and end up “pouring” a large volume of coolant to the general machining area but much of the time most of the coolant doesn’t even hit the cutters, and what does hit the cutter is usually at rather low pressure and velocity.

The SPIDERCOOL Fanuc Robodrill system includes a 3/4″ diameter hose that replaces the 1/2″ diameter factory hose.  This eliminates a major upstream choke point for coolant flow, providing over twice the area through which the coolant can flow to supply the SPIDERCOOL nozzles.  SPIDERCOOL nozzles have a smaller .281″ diameter orifice creating a tighter coolant stream at higher pressure and velocity.  This combined with the fact that SPIDERCOOL aims perfectly at the cutting edge of each tool, eliminates the need for a multitude of individual nozzles.  By increasing the throughput, and condensing the available coolant supply through one or two SPIDERCOOL nozzles, pressure and velocity are increased, and it all goes to the only place you need it.  On the cut.

“I have thru-spindle coolant.  Will SPIDERCOOL do me any good?”




Yes! Ask yourself this question:  “What percentage of my cutting do I use through spindle for vs. regular flood?” While through the spindle coolant is widely used today especially for deep hole drilling, most shops continue to depend on flood coolant for the majority of their milling operations.  In many applications flood coolant performs equally well or even better without the added cost of TSC ported cutters, holders and special filtration.  Many times when milling with TSC, the majority of the coolant can actually be whipped away from the cutter by centrifugal force.  We have many customers who use both through the spindle coolant, and SPIDERCOOL.  They have the best of both worlds.

“Do you offer different types of nozzles or nozzle tips for the SPIDERCOOL?”


Standard systems are equipped with our standard .281″ ID nozzle tube.  We make an optional special version of this nozzle tube that is threaded to accept 5 different sizes of nozzle tips that we offer.  These tips were actually designed for high pressure applications, to deliver a calibrated flow rate at 1000 P.S.I.  Some customers have found these tips useful under normal pressures to give a more pinpoint precision coolant stream.  These tips are also used for MQL and compressed air applications.  Fan type nozzles are not necessary because the SPIDERCOOL oscillating sweep cycle acts as an “electronic fan nozzle”.

“Can I run compressed air through the SPIDERCOOL?”





Absolutely.  SPIDERCOOL actually doesn’t care what it aims.  Coolant, oil, compressed air, heck it’ll even aim beer if you’re willing to waste it.