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I am building a line of Aluminium "general purpose" motor boats.
What abrasives do you recommend for blending hull welds?
Is there anything that we can use on our wide belt paper to slow down the glazing when sanding resinous
woods?
What
product do you recommend for shaping the deep contours in wooden
chair seats?
What
can be done to prevent warping with belts, discs and other abrasive
products?
When
sanding surfaces correctly, how many grits can I skip in a run?
What
PSI should I run my wide belts at?
KLINGSPOR
offers 6 sandpaper joint options for abrasive belts, which one should
I choose?
I intend on ordering
a mass quantity of your products. What is the shelf life of your abrasives?
As to most abrasives, the adhesive manufacturer's warranty the adhesive properties of their products (glues and tapes) for one year from the date of activation. Therefore, you most likely will not find any manufacturer who will warranty belts or sticky back discs for more than one year from invoice date on the product they sell you. It is our recommendation that you buy no more of these items than you can turn over in six to eight months, but we do warranty them for a year from invoice date. We also recommend you store them somewhere that is heat and humidity regulated as both those factors can adversely effect the adhesives as well as the backings.
What are some tips you could give
me on lubricating a Dynorbital sander?
Dynabrade recommends a 1 drop per minute setting when using an F-R-L (filter-regulator-lubricator). If this is not feasible,
it may be best to:
1) Place 2-3 drops at the coupler before using in the morning
2) Place 2-3 drops before using after lunch
3) Place 2-3 drops at the end of the day. After the last step, run the tool for 20-30 seconds to distribute the oil in the air motor, then
it will be fine to let it sit overnight.
I have a new concrete countertop for a BBQ that I would like to sand to a very smooth finish. I have an orbital sander that uses the
Hook & Loop to attach sandpaper to it. Can you recommend a type of sandpaper and the grit sequences to use.
The only suitable products we have with a Hook & Loop back are paper products, and therefore may not last as long as a cloth backed item would.
However, if you would like to try, we would recommend our PS11 which is a wet dry silicon carbide paper.
As for the grit range, that is a hard call for me to make not seeing the surface, but I would think if you started at 80 and went to 150 or so, you should end up with a fairly nice looking top. You can always sand finer if you decide you want more sheen to the concrete.
What are some tips you could give
me on lubricating a Dynorbital sander?
Dynabrade recommends a 1 drop per minute setting when using an F-R-L (filter-regulator-lubricator). If this is not feasible,
it may be best to:
1) Place 2-3 drops at the coupler before using in the morning
2) Place 2-3 drops before using after lunch
3) Place 2-3 drops at the end of the day. After the last step, run the tool for 20-30 seconds to distribute the oil in the air motor, then
it will be fine to let it sit overnight.
I am building a line of Aluminium "general purpose" motor boats. What
abrasives do you recommend for blending hull welds?
For blending the welds we would recommend the SMT Flap discs. If it's hard aluminum the SMT627 should work fine, if it's soft try the SMT630. If the welds are too large for these discs to take down in a timely manner, do the brunt of the take down work with the A46N Supra regular grinding disc and then go to the flap discs for the actual "blending" portion of the work.
After the welds are blended, you could use either the regular PS33 or the non-woven discs to try and even out the entire surface. The grit would be
determined on what product your working on, but 80 grit would be a good place to start with the PS33 and perhaps the medium density on the non-woven.
Is
there anything that we can use on our wide belt paper to slow down the glazing when sanding resinous
woods?
There is nothing on the market that you could spray on a belt that would deter glazing due to loading. If your belts are polyester (inherently waterproof) or if they've been chemically treated to be waterproof, you can wash them and clean them out somewhat. Some
shops are using a product called "Purple PowerŽ" that is available at any
retailer. It's ecologically safe so disposal is not a problem, and does seem to buy them some extra life on their belts. One other thing I might suggest is that when you are sanding soft, gummy or resinous woods, be sure your abrasive belts are Open Coat. This means that 50-70% of the grain has been removed from the backing so that as you sand and particles get packed up in the grain, they will have room to fall back out. Closed coat abrasives have 100% of the backing coated in grain and should be used for hard woods or metals only. They, of course, offer the best cut and finish because there are no gaps in grain coverage, but if you load the belt up before it's completely used,
less life and finish will occur.
What product do you recommend for shaping the deep contours in wooden chair seats?
You could use a fiber disc on a right angle grinder for the actual cutting. That would be the quickest.
Also depending on how deep you need to go, probably start with 80 grit and then adjust up or down based on removal rate.
What
can be done to prevent warping with belts, discs and
other abrasive products?
Warping and curling are usually signs of variations in or exposure
to heat and humidity. Visit Storage
and Handling Tips page of our web site to receive more information
or call Customer Relations at 1-800-645-5555 today and request our
Woodworking Reference Guide.
When
sanding surfaces correctly, how many grits can I skip
in a run?
We recommend you never skip more than one grit as you work up through
a grit sequence. When you do, you overwork the finer grit by asking
it to remove a scratch it is not designed to remove. This can result
in burning of the workpiece, belt and lower abrasive life.
What
PSI should I run my wide belts at?
The recommended PSI for our wide belts is as follows: 45 –
55 PSI for paper
55 – 65 PSI for regular cotton cloth
65 – 75 PSI for polyester
You will occasionally see poly belts being used to plane or dimension
metals or wood with a PSI over 70. For these types of operations,
this is acceptable. Paper belts should never be used for these types
of applications.
KLINGSPOR
offers 6 sandpaper joint options for abrasive belts, which one should
I choose?
Recommendations are as follows. If you are thinking about going
outside of these parameters, please check with our technical department
first.
All portable belts #4
1st choice #3 2nd choice/ for glass belts
All Dynafile belts #4
only choice
Intermediate belts (includes
backstand grinders and lever stroke sanders)
a. Cloth #4 1st choice #T 2nd choice after #4 failure/fine grits
b. Paper #4 1st choice #1 2nd choice for fine grits only Wide Belts
a. Cloth #4 1st choice
#T 2nd choice for fine grits only
b. Paper #4 1st choice #1 2nd choice for fine grits only
All Pump Sleeves #1 only
choice
Mold Sanders #6 first
choice #5 2nd choice
Edge Sanding #4 1st choice
#2 2nd choice, #5 3rd choice
**2nd choice for fine grits only designations are based on grits
150 and finer.
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