Hobs for Gear Cutting
KATEXIM EUROPE LIMITED ENGINEERING HOBS
Katexim Europe Limited provide world class hobs. A variety of hobs for gear making.
Hobs in Carbide or PM. Available as shell or shank type as well as Pre-cutting and Finishing hobs. Hobs are available with standard tooth profiles or with special optimised tooth forms taking into account the requested operating parameters, the process parameters or the cutting parameters.
Bore or Shank style hobs, worm wheel hobs, multi start, dual lead and special profiles.
Precision engineering hobbing tools manufactured to your requirements. Please send your enquiry to us via the contact form on our contact page stating your specific requirements and we will be happy to assist you further with your enquiry for engineering hobs.
We also can offer new and used hobbing machines. Please ask for details.
Please click here to go to the contact form.
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MASTER GEAR PROFILE
Master gear is used for checking the precision of the gear, especially in the automobile and aerospace industries. It features high precision, long tool life, and excellent efficiency. When the master gear engages with the gear on the rolling fixtures, the value of the tooth is inspected by a variety of indicators, chart of other indicating devices, etc.
HEAVY CUTTING HOB (ROUGHING HOBS)
Reduction of cycle time. Faster cutting with more hob teeth
Reduction of hob wear Reduced hob tooth flank wear and overlead because of double hob cutting edge compared to a conventional hob
More savings increased productivity through increased tool life
Most effective when cutting large module gears and gears with many teeth
Module 6. Module 32 A bigger module is more effective
The above specification for the hob may be changed at the customer’s request.
BUILT UP HOBS
The teeth and body are assembled separately and with different materials
An advantage is that the cutting condition is efficient controlled relief angle
Cost effective with lower material price for body
Useful for high speed cutting with controlled arbor.
The manufacturing process is complex
The out diameter of built up hob increases more than that of a standard gear hob
It requires more flexible delivery terms than a standard gear hob
A worm hob design is based on the worm shaft specification. There are no standards for worm gear hobs. Generally this hob is manufactured as ZK type. Since the overall dimensions of the hob are determined by the worm shaft and wheel data, please specify the following data when order:
Normal or axial module, DP
Out dia or pitch dia of worm
Worm lead angle
Number of threads and hand of thread
In case of shank type, shank standard
Contact ratio (Non standard) Standard contact ratio is general 20 – 30% and users can select either hole or shank type
It’s difference is based on the tooth maker. Please discuss when you order
The out diameter of hob is decided without diameter of worm and sometimes it is impossible to produce with an Arbor Typ Hob
When ordering a combination worm hob and arbor, please provide the arbor specification, taper of the hobbing machine, setting bolt standard and hob rotating direction.
In addition specify whether the contact of the arbor is right or left.
INVOLUTE SPLINE HOBS
A spline gear is used when the power transmits in the same rotating direction. The tooth profile is an involute profile. The specification is needed when order, as each country has a standard which follows their module value.
Fitted surface of tooth Fitted major diameter ax
Germany’s industrial spline standard (pressure angle 30 degrees ANSI B92.2 USA inch system standard JIS/KS D2001, B1603 standard
PARALLEL SIDE SPLINE HOBS
Out diameter and tolerance for parallel side spline (D)
Root diameter and tolerance for parallel side spline (d)
The width and tolerance for parallel side (N)
Amount of chamfer, grinding and LUG for parallel side spline hob
Amount of grinding when it grinds during the process
Standard and type for hob
Parallel side spline hob can be divided into 1 type and 2 type ex As shown in the table below, it is divided into MAJ dia and MIN dia
TIMING PULLEY HOBS
- Belt specification (pitch and belt type)
- Belt maker’s instructions
- NT of pulley
- 4. Pulley profile (details view)
- 5. Hob dimensions (OD X L X d)
Note. When you order please provide the name of the belt maker because each manufacturer’s tooth profile varies. Even if the standard for the timing hob you request is the same tooth profile, it may be different according to the belt maker.
Standard formula for pulley gear
OD= PCD (CKX2)
Carbide hobs can cut gears down powerfully at high speed which brings higher efficiency of production than conventional HSS hobbing.
Module M05 m2.0
Accuracy class DIN3968 class A/AA/AAA
High cutting speeds
Short machining times
A longer tool life than conventional HSS cutter
Time saving per piece for gear manufacture
Improved working environment by employing dry cutting
High suitability for dry machining
Lower gear generation cost
ROLLER CHAIN SPROCKET HOBS
ASA Tooth Profile Standard for chain ASA 1 ASA2 JUS 2 JIS U DIN BS
Pitch for chain, Roll diameter, No of chain
Specification for arbor which uses customer’s machine
Note The measurement for standard DIN/BS (8180, 8187, 8188) is
different so it needs to be specified when you order.
TURBO CUTTING HOBS
Increased productivity Special HSS and multi layer coating increased cutting ability more than double compared to conventional hobs
Cost savings increased tool life and reduced cycle time lead to cost saving efficiently
Friendly to environment Production without cutting oil
Successful results required Need a good hobbing machine for turbo cutting
Application Mass production of gears (high volume)
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