Engineering Gears
Urgent Breakdown Service
Manufactured from sample or drawing
One off or quantity production
Gear repair service: crack testing, magnaflux, and penetrating dies
Tooth rounding service
Micro gears made for small machinery or model manufacture
Gear grinding
Gear hardening
Wide range of materials offered: steel, stainless steel, cast iron, nylon, tufnol, bronze, aluminium etc.
Computer aided design (Gear CAD)
Gears play an important part in power transmission mechanisms and it is essential that they are of high quality and maufactured to high accuracy. We believe that i-trans' long experience in this specialised field will well satisfy your requirements.
Helical Gears
120 DP - 1.5 DP
.2 Mod- 16 Mod
6 teeth -200 teeth
O/D: 1mm - 1.4 metres
Internal Helical Gears (Information on request)
Bevel Gears
24 DP- 3 DP
1 Mod - 8 Mod
8 teeth -200 teeth
O/D: 10mm - 600mm
Bevel/miter gears can be manufactured in steel, nylon, cast iron or stainless steel
Spur Gears
120DP - 1.5DP
2 Mod - 16 Mod
6 teeth -400 teeth
1mm diameter to 1400mm diameter (O/D)
Gear shafts and pinions
Internal spur gears (25 inch or 600mm PCD)
Stainless steel spur gears, recommended for use in the food and chemical industries, are manufactured by I-trans
Nylon spur gears can be machined from moulded nylon resin.
Their features are:
1. impact and vibration absorbing
2. self lubricating
3. lightweight and smaller inertia
4. resistant to fatigue and wear
5. corrosion proof
6. noise reducing
Ratchet Gears Wheels
6 teeth -400 teeth
Single or double sided
Can be cut to any form
Common Gear Calculations & Questions
(1) Pitch of a Gear
  Module(m) and diametrical pitch (p) are measurements of the tooth size. Module in millimeters and diametrical pitch in inches are interrelated as follows:
m=25.4/p, and p=25.4/m (The bigger the m number, the bigger the tooth size, and the smaller the p number the bigger the tooth size). An example of this would be as follows:
25.4/2 module = 12.7 DP, and 25.4/12 DP = 2.116 module.
(2) Outside diameter of module and DP spur gears
  Module: Number of teeth + 2 x mod = OD in millimeters
e.g. 20T3 Mod: 20+2x3 = 66mm
Diametrical Pitch: (Number of teeth +2)/DP = OD
e.g 20T10 DP: (20+2)/10 = 2.200 inches
(3) Ways to eliminate gear noise
- Correct tooth contact; relieving the tooth tip will prevent end contact, tooth profile modification, and adjustment to the pressure angle.
- Correct backlash; nylon gears for example require more backlash than steel gears.
- Increase contact ratio; helical gears for example are quieter than spur gears.
- Nylon gears; depending on the application these maybe quieter than steel gears.
- Lubrication; high viscosity oil will reduce noise.
(4) Gear Ratios
  If for example you have a drive where a 20T gear is driving a 40T gear that would be described as a 2:1 reduction.
(5) Information that is useful for i-trans
- What power is being put through the drive and what is the application
- What kind of gears: spurs, helicals, bevels etc.
- General configuration of the gear train: how many gears and shafts
- What is the industrial environment like: dusty, dirty, food related etc.
- How many teeth
- OD of gear, width of teeth, shaft size , hub diameter, length and bore diameter, keyway
- Material of gear: nylon, stainless steel, steel

ring gears

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