INSTRUCTIONS OF PATTEREN MAKING

PATTERN

Wood and MDF is the most popular and commonly used material for pattern making. It is cheap, easily?available in abundance, repairable and easily fabricated in various forms using resin and?glues. It is very light and can produce highly smooth surface. Wood can preserve its surface?by application of a shellac coating for longer life of the pattern. But, in spite of its above?qualities, it is susceptible to shrinkage and warpage and its life is short because of the reasons?that it is highly affected by moisture of the molding sand. After some use it warps and wears?out quickly as it is having less resistance to sand abrasion. It can not withstand rough handily?and is weak in comparison to metal. In the light of above qualities, wooden patterns are?preferred only when the numbers of castings to be produced are less.

WHY WE USE WOOD OR MDF IN PATTERN

wood or MDF?is the most commonly used material for patterns, primarily because it is soft, light, and easy to work. Honduras mahogany was used for more production parts because it is harder and would last longer than pine.

REQURED TOOLS

1. CNC ROTER MECINE
2. carpentry tools
3. Bevel protector
4. Vernier caliper
5. radius gauge
6. scale

INSTRUCTIONS OF PATTEREN MAKING

If you want good mould then first you make good quality pattern. if you want good quality pattern then you must fallow these instructions they are

1. Clean the Working floor
2. Review the drawings if any drawbacks is there do modification before making pattern.
3. Check all the measuring instruments must be clean and should be calibrated or not.
4. then Take the MDF board and checked the thickness of MDF as per your requirements or not.
5. According to shape and curvature of drawing cut the templates on CNC other wise manually
6. if template shape is measurable do the inspection of template
7. if product is critical shape then you make the pattern cnc that time first you make mdf shape as per Blank provided as per design
8. then star the joining of mdf board with fevicoal or resin as per templets shape and wait for curing up to 12 to 24 hours
9. if pattern is spilt in more than one parts then use a template while joint the split parts and ensure all the split part must be match with profile shape
10. then you start the finishing of pattern with 180 nos sanding paper an after completing the finishing operation
11. then you apply the primer. then do visual inspection and touch and feel inspection.
12. if you observe waviness, any pinhole, and damages, then you apply putty and do finishing.
13. after completion finishing then you apply the once again primer after primer apply paint.
14. after completion of paint do sanding with using of diesel or do buffing.
15. then do inspect the dimensionally manually or 3d scanning it is ok or not as per drawing .
16. if it is not ok then do modification then you start to mould making process.