Laboratory CNC milling machine from AHP PLASTIK MAKINA has 3 version. Samples of up to 50mm thickness, 100mm thickness and higher than 100mm based on customer request.
In two first versions we have possibility of having spindles with two types of tool holder ER16 and ER 20.
ER16 collet has possibility of holding tools 2,3,4,5,6,7,8,9,10mm. ER20 collet can be used with tools of diameter range 2-13mm. Standard tools for sample preparation for laboratory purpose are 8,10,12mm in different cases. Let study sample shapes for mentioned standard:
Lets take a look at sample dimensions according to mentioned norms:
ISO 6259-2 includes 3 types of tensile sample piece as below:
Obviously with all of 8, 10 or 12 mm tool diameter tools, above 3 samples can be cut easily.
for ISO 6259-2 there are two tensile sample piece as below:
for the above two samples also there is no limitation for using 8, 10 or 12mm tool diameters.
ASTM D638 has 5 types of tensile sample piece as below drawing:
ISO 527-3 has 4 types of tensile sample piece as below drawings?
For ISO 179-1 there are two types of sample piece, with notch and without notch. dimensions are as below:
Considering above drawings for Charpy impact test samples , sample cutting is possible by CNC milling machine but notches need special notch making device:
For ISO 180 , Izod test sample is as below dimensions:
For ASTM D256 sample dimension is as below:
As a brief, important parameters of CNC milling machine for making above sample types are as below:
- CNC milling is only suitable for hard materials like HDPE, PVC, ….. It is not suitable for elastomeric and soft materials like rubber, ….
- Thickness is limited to maximum thickness of selected type of CNC milling from AHP
- For samples of less thickness, it is important to use clamp both under and above sample piece lengthwise.
- For high thickness samples like Type 3 of ISO 6259 it is important to use clamp at the both ends of sample piece.
- For samples including holes, need to care about size of hole. hole diameter need to be more than minimum usable diameter of tool.
- Sample dimensions need to be in the range of XY travel of the CNC milling machine.
- Z travel of CNC milling machine is dependent on maximum thickness request from customer side.
- Machine need to have air cooling hosing and air inlet connection. This is important to repel milling chips from milling zone. unless it will cause excess heating of the tool.
- Some of above samples like Izod, Charpy have some notches with very small radius of edge. These notches need to be made by special notch milling machine.
- All above samples can be prepared using CNC milling from AHP PLASTIK MAKINA.