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Ultra Polishing Schaumburg, IL (847) 352-5249
Advance Paint Technology, Ltd Cleveland, OH (216) 676-8770
Bales Mold Service, Inc. Downers Grove, IL (630) 852-4665
Bales Mold Service, Inc. Harlingen, TX (956) 412-8388
Bud's Polishing, Inc. Anaheim, CA (714) 632-0121
California Polishing & Plating Paramount, CA (562) 634-9031
CMPI Springfield, MO (800) 742-8043 (417) 831-7900
H & H Polishing, Inc. Charlotte, NC (704) 393-8728
Harrison Electropolishing, L.P. Houston, TX (800) 768-4706
IPS, Industrial Polishing Services, Inc. San Diego, CA (619) 661-1691
J.A. Brass Polishing Sacramento, CA (916) 922-0300
KMF Metals Inc. Oak Creek, WI (414)856-9393
Mirror Finish Polishing Company Kearney, MO (816) 529-6089
The Mold Polishing Co. Inc. Garwood, NJ (908) 518-9191
Ultra Polishing Schaumburg, IL (847) 352-5249
Things a Mold Maker Needs to Remember...
As you outline the mold building sequence make VERY sure to schedule mold-polishing time. Let your polisher know the scope of the project so that he can determine how much time to schedule for your job. The day that the job will arrive at the polisher should be selected in advance. The time that your job will be at the polishers will be shorter because your polisher was able to schedule time for this job in advance.
What to instruct your polisher
1) Identify all the shutoffs. Use a marker and shade in all of the shutoffs VERY CLEARLY!
2) What corners and edges need to remain sharp?
3) Are there corners that need to be benched on prior to polishing?
4) Indicate just what areas will be textured. What kind of texture will be applied? How deep will the finished texture be? (ie., 0006 deep or .0012 deep etc). The depth and kind of texture will determine the level of polish required. Knowing these specific details ahead of time can save your shop time and money.
5) Just what kind of steel is the detail being polished made of? Trade name of the steel? Hardness?
6) Do you want the vent runners polished? Are the vents to be lapped and polished? Did you leave stock for this to be done?
7) Are the shutoffs finished and all fitting completed? Should certain areas and details be masked (taped) for extra protection?
8) What kind of surface finish do you really need? Many of today’s engineered plastics will release more easily (or grip more readily) if they are polished to a specific finish. This is especially true in ribs and on no draft walls.
9) Just how was this piece machined? Was it finished in the cnc machine with a carbide cutter after heat-treating? The insert or block may need to be stress relieved if a truly high level of diamond polish is to be achieved. Carbiding can result in a surface hardened condition. This can cause problems for the polisher. If the surface is to be textured the polisher will need to acid test the surface to check that a consistent surface has been achieved. This is especially true of an edm-ed surface.
10) Pre-plan the polishing of the various inserts of the mold. What parts of the mold need to be polished first? Certain parts may have additional work scheduled to be completed after polishing. For example, in order to guarantee a sharp corner stock may be left intentionally in order to protect an edge from being accidentally rolled. In the case of large complex molds the side of the mold with the most assembly time can be polished first in order to save time.
11) Caution! Was this molding detail initially polished in your shop by a well-intentioned mold maker to let’s say a 320 stone finish? The polisher may have to go back and re-polish what this well intentioned person has overlooked. The 320 stone finish will hide a multitude of polishing mistakes that will only become evident after the polisher starts to apply a finer finish. The polisher may have to go back to a 220 stone to blend in the mistakes! Polishing is a profession that must be learned and practiced in order to achieve the desired results in the shortest time possible. Polishing is not “rubbing on the surface with a box of rocks”. It is a carefully orchestrated series of carefully applied skills that result in a polished surface… not to be attempted by unskilled or inexperienced hands!
12) Contacting your polisher at the beginning of a large complex mold can save you time and money! Remember that a polishing company works on and sees at least ten times as many molds a year as an average shop. The polisher can make some very helpful recommendations that can reduce polishing time and save time away from the shop!
13) Itemize all parts and or inserts that you send to the polisher. Things can get lost.
14) Make sure that all orders and information are in writing, NOT VERBAL.
15) Drop off polishing on time and pick it up promptly when it is completed.
16) Make sure that the cavities, cores, and components being polished are blown out and clean before they are taken to the polisher…no one wants to receive dirty work.
Know your finishes:
#1 Diamond Buff / A-1 / RA 0-1
#2 Diamond Buff / A-2 / RA 1-2
#3 Diamond Buff / A-3 / RA 2-3
600 Grit Paper / B-1 / RA 2-3
400 Grit Paper / B-2 / RA 4-5
320 Grit Paper / B-3 / RA 9-10
600 Stone / C-1 / RA 10-12
400 Stone / C-2 / RA 25-48
320 Stone / C-3 / RA 38-42
#11 Glass Bead / D-1 / RA 10-12
240 Aluminum Oxide Blast / D-2 / RA 26-32
#24 Aluminum Oxide Blast / D-3 / RA 190-230