New Product Announcement

NPA 044 ● TOOLHOLDING ● SPINJET

TOOLHOLDING
NPA 44/2018

New Generation SPINJET GREEN LINE
High Speed Compact Spindle
Replaces Existing SPINJET Spindles

Highlights

Following the success of SPINJET products - coolant driven high speed compact spindles for small diameter tools - ISCAR is introducing the SPINJET-GREEN LINE (TJS GJET) family of high speed spindles. The new family is a step ahead in developing advanced small-sized spindles operated by the coolant supply system of a machine tool.

Features

A broad range of output rotational speed: 35000-55000 rpm
A new improved bearing system:
- New bearing system design
- Increased number of bearings: 3 bearings inside vs. 2 in SPINJET TJS 20K, 30K and 40K spindles
- New bearing seal
- New bearing lubricant featuring greater viscosity and additive agents
A new shaft lock mechanism

Due to the new design features, SPINJET-GREEN LINE spindles ensure the following advantages:

Rotational speed range meets most required values
Bearing system design minimizes risk of overload and fluid penetration to considerably increase spindle reliability, resulting in significantly improved tool life
New shaft lock mechanism enables a simple and secure way of mounting a cutting tool in the spindle

General Data

Operating Data	Model: SPINJET-GREEN LINE
Operating range of coolant pressure [bar]	20 - 40
Operating range of coolant flow rate [l/min]	10-20
Rotational spindle speed [rpm]*	35000- 55000
Optimum cutting tool diameter [mm]	Drilling: 0.5 - 4
Optimum cutting tool diameter [mm]	Milling: 1.5 - 3.5
Maximum tool shank diameter [mm]	7

Notes

Rotational spindle speed is based on coolant pressure and flow rate
Coolant pressure is measured from the spindle inlet

Strategic Advantages:
Cutting Tools:

Small cutting tools (dia. 0.5 – 4.0 mm)
Small cutting tools at high speeds enable precision while reducing tool wear

Applications

Milling, drilling, thread milling, engraving, chamfering, deburring, fine radial grinding
Operation: Finishing and semi-finishing operations

Flexibilities:

CNC machines: milling centers / turning / turn mills / tap mills
Suitable for most adaptor types + lathe turret mounting

Economical Advantages

Upgrades existing CNC machine to a high speed milling (HSM) performer at a fraction of the cost of dedicated high speed machines
Boosts productivity - shortens production time and cuts costs
Quick ROI
Simple and easy to integrate - no pre-installation or external feed lines
Compact – no size restriction due to added parts or power feeds, fits ATC or turret
Cuts utility costs such as compressed air and electricity
Uses the machine’s own coolant as a pressurized power source

Industrial Sectors

Serves important industries worldwide:
- Die & Mold
- Medical
- Energy
- Automotive
- Aero space
- 3D Printing
- General Industry

New Shaft Lock Mechanism
Shaft lock flag key has been replaced by a “GJET” shaft lock key

Fig.1. Shaft lock in old SPINJET spindle

Fig.2. Shaft lock in new SPINJET-GREEN LINE

Machine tool requirements for using SPINJET-GREEN LINE spindles

Coolant flow through the machine spindle
Min. coolant pressure at the spindle outlet: 20 bar (290 psi).
Max. coolant pressure at the spindle outlet: 40 bar (580 psi).
Min. flow rate: 12 l/min (3.17 gal/min.).
Coolant filtration level: max. 100 μm.

Operating Tips

When operating the SPINJET-GREEN LINE spindles, monitoring rotational speed is critical. A correctly set rotational speed ensures optimal machining conditions and avoids damaging the spindle.
Cutting speed depends on workpiece material and its hardness, the shape of a machined surface, a machining strategy and cutting tool geometry. Refer to cutting tool manufacturer’s documentation.
Dramatic fluctuations of the rotational speed (rpm) operation can indicate problems such as an inadequate coolant pressure or a broken cutting tool.

Using Precision ER11 Collets
When using ER11 spring collets, it is recommended to use only high quality precise collets that are engineered for maximum accuracy and tool life.

Max. collet runout (TIR) - 5 μm

Example of Cutting Feeds:

Application	Material	Cutting Tool Diameter		Z (Teeth)	Ap - Depth of Cut		Ae - Width of Cut		RPM	Fz per tooth
Application	Material	mm	inch	Z (Teeth)	mm	inch	mm	inch	RPM	mm	inch
Milling Full Slot	Aluminum SI 9% 30 HB	End Mill Ø 2.0	End Mill Ø .080	2	0.3	0.012	2.0	0.080	40,000	0.01	.0004
Milling Shoulder	H13 ( 40-42Hrc )	End mill Ø 1.5	End mill Ø .059	2	1.0	.04	0.3	.012	35,000	0.008	.0003
Milling Shoulder	St 52-3 (A 36)	End mill Ø 1.0	End mill Ø .040	2	0.5	.020	0.1	.004	40,000	0.005	.0002

To maximize SPINJET-GREEN LINE spindle tool life, we recommend following the “10% rule”:

The working rotational speed (rpm) should drop by up to 10% of the rotational speed (rpm), which is registered at ‘idle speed’.

Keeping this rule ensures reducing axial and radial load on the internal mechanism.

To register idle rotational speed:

Install the SPINJET-GREEN LINE spindle carrying a cutting tool into the machine.
Start the spindle rotation by turning on the fluid supply at required pressure and find the idle RPM speed by reading the display monitor of the spindle.

Idle Speed

Working Speed

Fig.3. Example illustrating “10% rule”

General instructions for storage:
The SPINJET-GREEN LINE spindles do not require specific periodic maintenance; however the following instructions should be followed before storing a spindle:

Clean the spindle by air blowing for 10-15 seconds.
Max. air pressure for cleaning is 2 bar (30 psi). The rotational speed during cleaning must not exceed 50000 rpm.
After cleaning, disconnect the spindle from the display device.
Place the spindle in its original packaging box and store it in the appropriate place.

*** New Warranty Policy
Warranty policy for new SPINJET-GREEN LINE spindles:
At least 300 hours of use or 12 months from the date of invoice, whichever comes first.

Warranty policy for repaired / refurbished SPINJET-GREEN LINE spindles:
At least 200 hours of use or 6 months from the date of invoice, whichever comes first.

SPINJET-GREEN LINE
Compact and Powerful

TJS-GJET-ST
Coolant Driven High Speed Compact Spindles with Cylindrical Shanks