Hi guys, I need to come up with a way to polish the bolt pockets in aluminum covers and other hard to get to spots. I have an air die grinder which takes 1/4" bits, wondering if anyone has found a store bought goodie or has made one that works for that application. Guess one would need a device to clean the crud out first without removing the metal. Jack
Hi John, Just got an Eastwood cataloge today, they also have some small buffing attachments. Was hoping for more responces to this post regarding homemade gizmos, must be a lot of good ideas in use out there. Also saw in Eastwood a small plating kit ( tin-zinc) possible for nuts and bolts, wonder how it compares to cadmimum? Jack
Those little items do, indeed, work great. I have a 1/8" collet for my die grinder that I use for these things.
Generally, I clean out the indentation first with whatever cleaner if available (Simple Green, etc.) and a toothbrush, then start with one of the little wire brushes in the die grinder. After that, I move to the pointy felt bobs, progressing through the various colors of buffing compound.
If you've got nicks or scratches inside the indentation, you can work on those with the little pointy grinding stones first.
Peter Gareffa St. Clair Shores, MI '70 Bonneville '66 T100 '55 T110 '70 Norton Commando '88 BMW R100RS
Those little items are obviously Dremel attachments. The tool itself is a handy item as it is variable speed and easy to work with. I haven't heard anything good about those small plating kits though I've never used one. My opinion is Cad looks like Cad. Zinc looks like Zinc. Although some is close. Whenever I send out a batch for Cad plating, I always throw in quite a bit of extra fasteners, brackets, antique bottle openers, etc.. Even standard nuts and bolts just in case. You can add an awful lot to a batch on a complete bike and not throw off the price by very much at all.
This is a very complex question. External fasteners in general were mostly cadmium plated but there are lots of exceptions. An example being the screws for the air screen on TLS brake assemblies, which were chrome in some cases. As were some triple tree clamp bolt applications. Obviously internal engine bolts should not be re-plated. There are also issues with external engine fasteners depending on the condition of the parts being plated and the process used to do so. Most fasteners on older machines require some prep as the threads are worn and the plating process magnifies the flaws in the threads creating much difficulty in reassembly. External engine fasteners that are not properly prepared and plated will not thread into heads and cylinders. When tight threading and not within proper tolerances, the force used to tighten things down can distort aluminum and steel creating poorly mated surfaces. Attention can be paid to Mr. Healy's advise on the proper installation of head bolts on later model Triumphs and the result of such distortion. Forcing tightly threaded bolts installing these components has the same effect. This is one reason it is a good idea to have extra pieces added to the cad batch. As a tight head bolt can be replaced. Unfortunately we are not all in the position to afford this luxury
Thanks John. I was thinking after I posted my note that I should have added "except chromed pieces and internal fasteners". I guess I'll get to work with a wire brush and a pan full of Simple Green tonight.
JT, You want to check with whomever will be doing any cadmium plating for you to find out what kind of prep he would recommend. The outfit that used to do mine required nothing. I always had excellent results. Unfortunately, due to the government regulations and environmental concerns a lot of platers have abandoned cadmium plating due to the costs. A call to the plater might save you a lot of time and Simple Green.
,_o _ -\_<, (*)/'(*)
Re: Polishing problem#46627 04/03/065:47 am04/03/065:47 am
hi, go to msc or some other supplier that carries cratex points...they work great on small deep holes and come in different grits. i just use the extra fine green type and a dremel. once you clean the holes out you can final buff with a small buff bob if you want to but most of the times it is fine after the cratex points....joe
and on the cad plating,as long as there are aircraft there will be cad plating so just ck around there are still many places that do it and several have been mentioned here...remember that cad is a heavy metal and should not be buffed sanded or ground without taking proper steps to protect yourself...that cad dust is some bad shi-. send your parts out to have someone do it, the kits are not real cad and don't work that good not to mention the chemicals and contaminates you have to deal with.
Joe, you are right. There are many people out there still doing cad. My plater stopped doing it as it would have cost him upwards of $150,000 to come into compliance. He also said he would have to test his employees on a regular basis due to the nasty stuff used in the process. Not worth going into here. His business has been there since the twenty's and at 65 he wasn't ready to embrace today's regulations. Can't really blame him.
Within industry, there are lots of engineers who wish for a return to cad plating. Especially in the hydraulic fitting industry. Cad has much more natural "lubricity" than does zinc. And much less issue of hydrogen embrittlement with cad than zinc on high strength fasteners. But the down side is the environmental issues.
As one fastener engineer told me - during zinc plating most offensive chemical is the muratic acid bath to cleanse/etch the parts. The least offensive chemical in the cad plating process is the muratic acid to cleanse/etch the part!
Yes, people in the aerospace industry still cad plate. It is the hydrogen embrittlement thing, lubricity of threads, and overall better corrosion resistance of cad still has a home in that industry.
Life is too short to drink cheap, bad beer.
Re: Polishing problem#46631 04/04/062:05 am04/04/062:05 am
cad is just much better than zinc against corrosion...and hyrdrogen embrittlement is not a good thing, it is one of the problems along with over and undertemper martensite that airlines deal with on high strength steels. and don't agree with the lubricty of threads as there is galling problems caused by any excess of cad on large diameter strut gland nuts,engine fan or turbine nuts etc....
Excess plating of any type will cause galling. The term lubricity has to do with the surface finish of correctly deposited material on threads. Zinc has a coarse surface finish. Cad has a smooth surface finish.
During the change from cad to zinc plating, both the fastener industry and hydraulic fitting industry had suffered a significant amount of problems with galling and excessively tight fit in threads.
Both industries have made changes in processes and fits to alleviate the issue. Some in the hydraulics fitting industry (Parker in particular), has gone to adding a dry wax type material to the threads to restore the "lubricity" that existed prior to the change to zinc plating.
For those of us with British bikes, we can thank the aerospace industry for sticking with cad. It has advantages that are important in aircraft components. As long as the aerospace industry resists other forms of plating, we can still find people to do our cad plating!