Sitemap: TAPS, DIES, DIENUTS, Drills, Reamers, Milling Cutters, Slitting Saws, Toolbits

The Tap & Die Co
445 West Green Road
London N15 3PL - UK
Tel:+44 (0)20 88881865
Fax:+44 (0)20 88884613
Email:
sales@tapdie.com

www.tapdie.com

LARGEST
On-line for
TAPS DIES Drills
or click:  ‘Products’
Established since 1978

CURRENCY Converter

SITEMAP

Reamers Guide

Reamers Guide for Predrilling Diameters for Reaming (Recommended):

DIAMETER OF REAMER
 

PREDRILLING DIAMETER

Two-flute drill

Core Drill

mm

inch

mm

inch

mm

inch

2 - 6

1/16 - 15/64

-0.2

-.008

-0.2

-.008

6 - 10

15/64 - 25/64

-0.3

-.012

-0.25

-.010

10 - 14

25/64 - 9/16

-0.4

-.016

-0.25

-.010

14 - 18

9/16 - 23/32

-0.5

-.020

-0.3

-.012

18 - 30

23/32 - 1.3/16

-0.6

-.024

-0.4

-.016

30 - 50

1.3/16 - 2

-1.0

-.040

-0.5

-.020

  Notes: For hand reaming rather less stock may be left in order to reduce the effort required. We suggest the nearest standard drill diameter to the calculated diameter from the above table will be acceptable. Special drill diameters should  not be required for predrilling


REAMING RECOMMENDATIONS

 Choice of Reamer:
 Straight Flute reamers may have advantage in blind holes, since lefthand spiral flutes tend to push swarf forward. Generally speaking the standard range of reamers will suffice for reaming most ferrous and non-ferrous metals.

 Reaming Speeds:
 Should be approximately 50% of the speed used for drilling the same material. Faster speeds are generally not an advantage , but may be possible in exceptionally rigid and efficient designs. Chatter degrades the surface finish and must be strictly avoided.
 (Refer: ‘Drills Guide’ and ‘Drill Speeds/Feeds’ by clicking on the buttons on the left).

 Reaming Feeds:
 Should be approximately 100% greater than the feed used for drilling the same material. Insufficient feed may degrade the finish and roundness of the hole and increase tool wear.

 Coolants:
 Should be as that recommended for drilling. Adequate coolant supply ensures a good surface finish

PRINT any Technical Data page you are viewing - [To help you do this, go to: File menu (click on it), click on Page Setup (in dropdown menu) - set Margins at 6mm for Left, Top, Right, Bottom - click OK. -Go back to: File menu (click on it)- click on Print - type Number of Copies required - click on Print. It will now print the information

©=copyright - ‘Technical Data’ shown in our site can be freely used.  This information must NOT
be reproduced or published in any article or website, without the written permission of:
 The Tap & Die Co, London