Cnc Engraving Bits

CNC router cutting MDF?

I need to find a way of cutting a sheet of MDF which the dimensions 2500mm x 1250mm x 30mm, into strips 12mm wide.

The cut surfaces must be totally free from tool marks and the strips of MDF must be cut completely straight with 90 degree edges. I've obviously considered using a cicular saw but that would leave some saw marks on the material (importantly, it would not be possible to sand the MDF after cutting).

Is it possible to do this with a cnc router/engraving machine? Obviously I would lose a fair amount of material due to the cutting width of the router bit, but as the MDF is quite cheap I don't mind this.

You might check with some local sign companies - I used to work for a company that made CNC routers that they would use to make faces and back of channel letters.

They usually have extremely sharp bits that will make a nice clean cut without the need for any cleanup. Maybe take some scraps to let them test out the type of bit that will cut your material the best. Playing with router RPM's and cut speed (inches per second) are also ways of gauranteeing the best results.

Bits $7.93 Bits

CNC TURNFIN $4.5 CNC TURNFIN

Prox Tech 38635 Complete engraving kit with trial glass $97.5 The engraver GG 12 spins at 20 000 rpm yet weighs only 4 ounces It allows for easy control and thus very safe operation featuring a touch sensitive switch for easy use and a simple push in/pull out shaft holder for easy accessory changeover (shaft capacity Diameter 3/32 only). The set includes: Engraver GG 12 AC adapter (12 18V 0.5A) trial glass and four bits: two spherical head diamond grinding bits Diameter 1/32 and Diameter 5/64 for engraving and line work two silicon carbide grinding bits (conical and bullet shape) for shading and frosting (all shanks 3/32 as well as one corundum grinding bit in ball and cylinder shape for grinding and engraving). The bits are also optimal for working on metal stone shell and other hard materials. Direct voltage: 12 18V. Speed: 20 000 rpm. Length: 5.7 .

Prox Tech 28920 Glass engraving set 4 pcs. $22.63 MICROMOTaccessories for rotary tools. Selected sets (all measurements in inch). Tool set for glass engraving 4 piece set consisting of 2 diamond grinding and silicon carbide bits diamond grinding bit 1: sphere 3/64 (1 mm) diamond grinding bit 2: sphere 5/64 (1 8 mm) silicon carbide bit 1: cone 7/64 /5/64 x 13/64 silicon carbide bit 2: cylinder 5/64 /3/32 x 9/32 . Used for engraving frosting and scribing.

Prox Tech 38515 Model builduing and engraving set $167.7 You are ready to start right away with MICROMOT 50/E 34 bits and AC adapter. A complete kit with MICROMOT Rotary Tool 50/E plus 34 industrial quality cutters: 1 diamond grinding bit 1 fine cutter 1/64 and 1/32 (0.5 and 1.0 mm) microdrills 1 brass brush 4 carborundum grinding bits (cylinder sphere disc and cone shaped) 1 saw blade 4 grinding wheels 7/8 x 7/64 (22 x 3 mm) 2 each carborundum and silicon carbide grinding discs 20 cutting discs 1 mandrel. Set includes also 6 MICROMOT high quality steel collets in size 1/32 1/16 5/64 3/32 7/64 and 1/8 (1.0 1.5 2.0 2.4 3.0 and 3.2 mm). With AC adapter for 110120V AC operation (12V DC 1.0A). Kit is packed in a durable plastic case. All new tools come with a 2 year factory warranty.

CNC 3-Blade Set(CNC Grips & Swash Plate) $85 CNC 3-Blade Set(CNC Grips & Swash Plate)

CNC 3-Blade Set(CNC Grips & Swash Plate) $85 CNC 3-Blade Set(CNC Grips & Swash Plate)

CNC STRUT SET 6mm/7.5mm $16.5 CNC STRUT SET 6mm/7.5mm

CNC RUNDER-ASSEMBLY 75mm $16.5 CNC RUNDER-ASSEMBLY 75mm

CNC WATER COOLED T-MANIFOLD26CC $31.5 CNC WATER COOLED T-MANIFOLD26CC

CNC Metal Swashplate $13 CNC Metal Swashplate

CNC Metal Tail Unit $18 CNC Metal Tail Unit

CNC Metal Washout Base $12 CNC Metal Washout Base

CNC See-Saw Set $18 CNC See-Saw Set

CNC See-Saw Spindle $5 CNC See-Saw Spindle

Spring Loaded Engraving Tool for CNC Machine Engraving

What is the minimum size of router bit you can use with a small CNC routing/engraving table?

I considering buying a CNC router table (max material cutting size is 1200mm x 800mm x 90mm). The website indicates the blade holder specfications are 3.175mm, 4mm & 6mm. Does this mean that the minimum router bit size I can use with this machine is 3.175mm? Basically, I want to cut narrow straight slots in a sheet of MDF and I need them to be as narrow as possible. Does this mean that this machine cannot cut slots more narrow than 3.175mm?

Finally, the sheet of MDF would be 30mm thickness. If the machine was to router/engrave completely through the sheet e.g to a depth of 30mm, would the cut be straight and clean with no tool marks on the cut sides of the MDF? Would a router bit with a thickness of 3.175 struggle to do this?

The holder specs refer to the 'shank' size of the bits you use. Typically, you can find just about any 'cut' size of bit you want, in those different shank sizes. What it will physically look like to you, is the shank will be larger than the cutter.... this is actually quite common.

Other things to consider when purchasing bits.... spiral cutters, or even double spiral cutters to prevent chip out of the material. Something to consider if you are going to be using melamine products.

I would suggest that you ask some questions of someone who has one of these router tables -- the company should be more than willing to give you references.

Have Fun.