Page 30 - Roberston & Sinclair Catalogue

Shank Type Tools
The information given should only be used as a guideline or starting point for feed rate selection. Your actual feeds and speeds will vary widely as result of “contributing factors” such as machine rigidity, horsepower, collet condition, spindle integrity,
part clamping, hold down and many other factors. Generally speaking, solid carbide tooling will perform better (i.e. longer life, less tool breakage) at faster feed rates. We recommend a “starting point” feed rate and increasing the feed rate until part finish becomes undesirable or other limiting factors become evident.
CHIP LOAD INFORMATION
The chip load is a measurement of the thickness of material removed by each cutting edge during a cut. This is a valuable piece of information which can then be used to calculate new set ups.
Calculations are as follows: Chip Load=Feed Rate (millimeters per minute) / (RPM x 2 flutes) Chip Load = 0.4233
Chip loads are based on material thickness of average size for the cutting edge length of the tool. These recommendations do not apply to thicker materials or tools with long cutting edge lengths. These chiploads are only a recomended starting point and may not accomodate all circumstances. Therefore, tooling damage may still occur and use of this chart does not warranty against tool breakage.
We would strongly encourage you to consult us directly on new tool applications. Our staff would be more than happy to discuss any technical questions.
RECOMMENDED FEED RATE SETTINGS
TOOL DIAMETER
3.175
6.35
9.52
12.7 & Over
TOOL DIAMETER
3.175
HARD WOOD
.076 - .127
.2286 - .2794
.381 - .4572
.4826 - .5334
SOFTWOOD/ PLYWOOD
.1016 - .1524
.2794 - .3302
.4318 - .508
.5334 - .5842
MDF/PARTICLEBOARD
.1016 - 1778
.3302 - .4064
.508 - .5842
.635 - .6858
HIGH PRESSURE LAMINATE
.076 - .127
.2286 - .3048
.381 - .4572
.5842 - .635
PHENOLIC
.1016 - .1524
.1524 - .2032
.254 - .3048
HARD PLASTIC
.0508 - .1016
.1524 - .2286
.2032 - .254
.254 - .3048
SOFT PLASTIC
.076 - .1524
.1778 - .254
6.35
9.52
12.7 & Over
OTHER VALUABLE FORMULAS
Feed Rate = RPM x number of flutes x chip load
RPM = Feed Rate / (number of flutes x chipload)minute)
RPM SELECTION
The general operating rpm for tooling contained in this catalog is between 10,000 and 20,000 revolutions per minute. Usually the higher the RPM, the better surface finish becomes. However, the higher the RPM, the more friction is generated between
the tool and the work piece. This friction is what creates the mechanical wear on the cutting edge. Your goal is to select the lowest RPM possible for each application.
If you need to solve premature tool failure, or under performing tools that are affecting your business, our technical staff can advise suitable options. We hold a wide stock range in our Branches and stock order is landed weekly from USA.
.254 - .3048
.3048 - .4064
SOLID SURFACE
.0508 - .1016
.1524 - .2286
.2032 - .254
.254 - .3048
ACRYLIC
.076 - .127
.2032 - .254
.254 - .3048
.3048 - .381
ALUMINIUM
.076 - .1016
.127 - .1778
.1524 - .2032
.2032 -.254
PHONE 0800 866 546 EMAIL sales@rands.co.nz WEB www.RandS.co.nz
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