Safety & FAQ

1. Important safety considerations

1.1 Safety tools
Machine tools for machining wood present a risk for the operator of such machines because of their high cutting speeds, their shape and sharpness, and if they are poorly designed, produced or incorrectly used.
Leitz tools are designed to the latest state of the art in tool technology and are made of specially selected tried and tested materials. They are quality tools ensuring:
" optimum protection against accident
" minimum pollution
" high performance and
" economy of use
Depending on the application, different tools are offered for:
" working with manual feed
" working with mechanical feed
Tools for working with manual feed are designed to achieve certain safety aims for manual feed in particular:
" to reduce the injuries on contact with a moving tool
" to reduce the kick back of the workpiece
With the aims of maximising the safety of woodworking machine tools whilst working with them and reducing the risk of injury to the user, tool manufacturers and timber associations in Germany have joined together to produce DIN standards and accident prevention regulations for implementation and by this they have made the runners for others regarding safety technique in Europe.

These proved safety regulations are a considerable basis of the European standard EN 847-1 "Machine-tools for the woodworking industry safety demands. Part I: Cutting and planing tools, circular sawblades."

It has been worked out by the help of the European tool producers and is valid in the countries of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Sweden, Switzerland, Spain and in the United Kingdom (U.K.).

In Germany the European standard has been adopted by the German standard committee DIN as German standard DIN EN 847-1.

The examining and certification board of the German trade association for the woodworking sector at request carries out examinations of the woodworking machine-tools in accordance with the DIN EN 847-1 and furthermore grants the well-known BG-TEST certificate for manual feed tools
The allowed limits and the examination conditions in its wording has become like the standard DIN EN 847-1.

The general safety specification for a tool defined by the DIN EN 847-1 includes:
" maximum RPM
" minimum balance quality
" minimum clamping length and knife thickness depending on the knife projection and cutting material
" knife clamping mechanism (form fitting or friction)
Leitz tools meet this European standard for safety, both in form and quality.

1.2 RPM limits

Tools with bores and tenon must be designed for speeds up to 12,000 RPM inclusive of a safety factor of 4 and for speeds of more than 12,000 RPM as safety factor of 2.25 applies. The proof can be effected by the help of calculation proceedings and by a centrifugal force examination.

1.3 Balancing quality according to ISO 1940-1
" Single part tools, tipped tools and bodies of tool sets: G 16
" Bodies for long planerheads for surface planers and combined surface planer thicknessers: G 6.3
" Tool sets: G 40
1.4 Tools for manual feed
" The limited gullet width "s" as defined when the regrinding area of both the cutter and, if present, the limitor, are exhausted is restricted and related to the large diameter of the tool.
" The cutter projection is related to the tool body or limitor and kick back speed as follows
- for non-circular shaped tools with a cutter projection of up to 1.1
mm: vR/vc < 0.25
- for circular tools cutter projections of up to 3 mm are allowed, but
at a reduced kick back ratio (DIN EN 847-1). The examination will be
effected by a kick back test.

1.5 Tools for mechanical feed
Mechanical feed is the term used for a feed mechanism for the workpiece or tool that is incorporated in the machine and with which the workpiece or machine element with the tool is held in position and guided mechanically during machining.
Tools for mechanical feed must comply with the general safety requirements as per DIN EN 847-1 in force.

There are, however, no limits in terms of cutter projection and gullet width.

The tools are marked with MEC and may only be used for working with mechanical feed.
1.6 Cutter clamping with composite tools

The knife clamping system must be secured by keyed elements to prevent the individual parts moving due to the effect of centrifugal forces. The design must ensure that the required minimum clamping length of the knives is observed. Friction clamped knives are allowed:
" for knives in tools for surface planers and planer thicknessers with knife widths greater than 150 mm
" for knives in tools (planer knives only, not profile or bevelling knives) for machines with mechanical feed
" for tools in chipping and chopping machines with mechanical feed


Q1. Why use Leitz Tools:

ANSWER: Leitz is a world class tool manufacturer with 125 years of experience in wood working technology and have a wide range of tools for your various applications. Leitz has set up modern state of the art Service Centres to service the tools which is essential to enhance the life of the tools and to produce high quality products. Tools are serviced by qualified technicians, trained by German Engineers.

Q2. What facilities are available at Leitz Service Centres?

ANSWER: Servicing: At Leitz Service Centres, we have the most modern facilities for regrinding and reconditioning of all types of tooling with the servicing conforming to International Standards.
Manufacturing: The Bayswater manufacturing plant can manufacture tools from HSS, Carbide and Diamond as per the customer’s requirement.
Trading: Now world class tools from Leitz are within your reach. Any standard tools in our range, will be made available to you within a short time.

Q3. How do I choose the right sawblade for my application?

ANSWER: Refer to Leitz catalogue or CD.
Our application Engineers are also available to help you to identify the right tool for the right application. Please contact us for this.

Q4. How do I know when the sawblade is due for regrinding?

ANSWER: Any of the following
" When you notice burr on the cut edge.
" Edges (chipping) breaking in laminated board while cutting
" When you observe the "increase in Resistance" during cutting.
" If the tips have chipped off or broken during operations (due to presence of foreign particles)

Q5. Can you retip all the tips in a sawblade?

ANSWER: No, Leitz retips only 25% of the total tips. It is not advisable to retip more than 25% of tips as it becomes uneconomical.

Q6. What should be done when a Sawblade wobbles ?

ANSWER: Ensure that the sawblade is properly clamped with correct size of flanges. Remove any dust or dirt between the flanges and blade while tightening.
Check for any play in the spindle.
Send the sawblade to our service centre for check up after checking for the above two points.

Q7. Can I continue to use if one or two teeth are broken?

ANSWER: It is better to replace the broken tooth immediately, as chances of further damage of other teeth are likely to occur.

Q8. How many regrinds I can get in a Leitz Sawblade?

ANSWER: About 15-20 regrinds, if the blades are sent for service as soon as possible after you observe the points detailed at Q. No.6.

Q9. Is anything other than sharpening done when servicing?

ANSWER: The tool geometry is restored to its exacting original specifications. The blades are checked for body tensions if required. Tips are changed wherever necessary etc. All these go to give you a superior performance from your old blades.

Q10. Does Leitz service all makes of tools?


Q11. Is a larger number of teeth required for a better finish in a sawblade?

ANSWER: This is not so. It depends on the type of work piece material, machine or whether it is for longitudinal or cross cut of material. Please call our Application Engineer for the selection of the right type of tools.

Q12. How do I ensure optimum use of Leitz tools?

ANSWER: By selecting the optimum speed and feed. Please refer to the chapter "important information and tables" in the Leitz LEXICON.

Q13. Is balancing necessary for tools?

ANSWER: Yes, balancing is necessary to ensure that the tool does not wobble while running. Wobbling in turn affects the component finish, increases the cutting load and affects the spindle bearings.

Q14. Is there a Sawblade that can be used on a Circular Saw Machine without scoring attachment to size prelaminated particle boards without chipping?

ANSWER: Yes. Sawblades with hollow tooth - flat tooth (HZ/FA) or flat Trapezoidal (FZ/TR) tooth configurations can be used with good results. Please consult our Application Engineer for details.

Q15. What sawblade should I use for cutting laminate sheets, single or in stacks?

ANSWER: A sawblade with Flat/Trapezodial tooth configuration is the one suitable for this application. Dimensions are to be selected on the basis of the machine being used.

Q16. I have some specific profiles to be made which are different from the ones shown in the catalogue. Can it be done?

ANSWER: There is a high quality Profile Grinder in our Service Centre, which, in combination with CAD, and the help of a Profile Projector, produces specific profiles.
It can be done on the blank profile knives in case of Cutterblocks with replaceable knives. Special brazed solid type cutterblocks can also be made as per sketch or sample piece of profile. The specifications of the Spindle Moulder like pm, spindle dia, maximum dia of tool possible, are also to be given in the enquiry.

Q17. Can Router Cutters be used on the Portable Drilling Machines or the Pillar Drilling Machines which are used for drilling metals?

ANSWER: No. Router Cutters have to work at high r.p.m. of at least 12000. Drilling machines, especially the ones for metal have low r.p.m. of 2500.

Q18. Can Dowel Drills be used for drilling through holes?

ANSWER: No. Dowel drills are only for drilling blind holes. For drilling through holes, a Through Hole drilling bit is to be used.

Q19. Can Leitz tools be used on all machines?

ANSWER: Leitz has specific tools for specific makes of machine. These are detailed in the catalogue. If still in doubt, ask our Application Engineers.