Frequently Asked Questions:


I can't see where I can buy on your website?
Although we will sell most of our products nationally, our website is not automated for purchasing. We also like to discuss your needs to make sure you get the best possible product for your job.
Give us a ring, or send an email. We will send you a written quote, including shipping if required.
If you want to go ahead, you can pay via credit card over the phone, PayPal or direct deposit.
We can then send the goods with a tax invoice and tracking number, usually the same day payment is received.

Where is your office?
We are based in Bibra Lake, 20k south of Perth in W.A., so if your are local, feel free to drop in.
See all our contact details, including phone numbers, email, street address, opening hours and a map here. Look for the UDT sign on the road edge.
But we are also happy to send most of our items anywhere in Australia.

Will you post items to the eastern states or overseas? 
We are happy to post most products nationally. The price for shipping varies on the size and weight of the products you are ordering.
We won't ship machinery as the freight is too expensive. Let us know what you are chasing, and we can point you to a local supplier in your state.
We don't ship internationally.


What are diamond blades used for? 
Diamond blades are used for quickly cutting very hard materials including concrete, asphalt, bricks, glass, and ceramics in the construction industry.
By comparison, traditional saw blades or abrasive blades can be easily damaged and wear out quickly.
Although more expensive initially, a correctly selected diamond blade will cut faster, finer and last longer. This ultimately saves you money.

How do you use a diamond blade?
It would be almost impossible to outline all operating and safety procedures to suit all saws on all work sites in all conditions.
However, here are a range of factors you need to consider when using diamond tools. Click here to see our tips.
You can also look at the operation manuals of various machines like quick cuts, floor saws, brick saws etc on our website for extra tips here.

What are diamond blades made of? 
Diamond blades are not made fully out of diamonds. They have a steel core with an edge of powdered metal that has been mixed with diamond crystals.
These aren't jewellery type diamonds, but tiny synthetic diamonds that are made with a high-temperature, high-pressure synthesis process. It is fully explained here.

How long do diamond blades last for? 
It depends on many factors such as the bond of the blade you are using, the power of your tool you are using it on, what material you are cutting, whether you are cutting wet or dry, the skill of the operator, how deep you are cutting, how much force they apply (don't force it) etc .
Generally, short blade life is caused by using a bond which is too soft for the material being cut. It usually occurs when cutting more abrasive materials such as asphalt, green concrete or limestone.
Wet cutting will also extend the life of a blade compared to dry cutting.

My blade is no longer cutting well - can I resharpen it?
Yes, you can. Chances are it is glazed from cutting hard materials. See how to de glaze it here.

My tiles are chipping when cut - why?
Chipping can be caused by-
- Wrong blade for the material
- Material is not securely held in place
- Check saw to make sure it is not out of alignment (cutting on a slight angle)
- Check saw’s condition to make sure bearings and rollers do not have any wobble or play
 - Reduce feed rate ie don't push through too fast
 - Insufficient water
 - Blunt blade. See our dressing stones here

Can I cut with your blades dry?
Cutting dry on some materials creates silica dust (respirable crystalline silica), which is very dangerous.
See the W.A. government's info on RCS here.
Also, cutting without coolant will shorten the life of the blade, as well as risk it overheating.

How much do diamond blades cost?
The price of a diamond blade varies depending on the size of the blade, and the quality.
For frequent use and larger jobs, it is better to choose a more expensive Premium Series diamond blade as they will deliver a longer life and a lower cost per linear metre of cutting.
However for occasional use and smaller tasks, it is quite often preferable to choose from the lower priced Trade Series diamond blades.
We also have stocks of budget blades, which are ideal for DIY or tradies with a one off job.
Feel free to give us a call, or send us an email and we can give you an exact price.

I can get the same blade at half the price elsewhere - how come?
All diamond blades kind of look the same to most people. One main difference is the amount of diamonds they contain.
The difference between a $100 blade and a $300 blade is usually $200 worth of extra diamonds. Better quality diamond blades have more diamonds, cut faster and last longer.

How deep will my diamond blade cut?
To see how deep a blade will cut, and what speed it should run at, see here.

Will you send your blades Australia wide?
Yes. Blades up to 300mm/12" (around 1.6kg) will fit into a large post bag.
Our 350mm/14" and 400mm/16" blades will fit into a extra large post bag. They can hold 1 x 16" blade (2.6kg) plus some smaller blades, or 2 x 14" blades (2 x 2kg).
Post bag prices are here.

Can you recycle diamond blades?
Steel is easy to recycle, and it can be quite valuable, so it is best for the environment if we all recycle as much as we can.
Your local recycling centre/transfer station should have a metal recycling bin onsite.
Or you are welcome to drop them in to us.

Do you supply blades for cutting aluminum, steel, wood etc?
We generally only supply diamond blades and not abrasive cut off wheels or tungsten tipped blades. Your local specialist hardware store can help you with those.

Core Drills:

Will you send your core barrels Australia wide?
Core barrels (even the smaller sizes) are generally over 400mm long, so need to go in a extra large bag (up to about 100mm should fit in a 5kg bag, maybe even two depending on the diameter).
So grab a couple (or some diamond blades) and reduce the price of freight per barrel. A 18mm core barrel (1/2" thread) is 0.5kg, while the 1 ¼" bits start at 0.8kg.
We are happy to send you a quote. Air bag prices are here.

My core barrel is no longer coring well - can I resharpen it?
Yes, you can. Chances are it is glazed from cutting hard materials. Reduce the water by half for a few minutes, or try drilling into an abrasive material like limestone, a cinder block or similar.
A bit of Ajax or builders sand down the hole can also have the same effect.
See how to de glaze it here.

What speed should I run this core barrel at?
The bigger the core barrel diameter, the slower it has to run. See our core speed chart here.

I am trying to core laterite, and it is really hard and slow to core. What do you have for it?
Because laterite is natural, it's composition varies. Sometimes a standard limestone barrel will be sufficient  but most times a specialist barrel is required. Laterite is generally very hard and slow to core. We sell these in 127mm diameter, the most common size for fencers.
Tips - Ensure operator uses a correctly sized core drill and stand (that is bolted down firmly), at correct speed to suit the barrel diameter.
Do not force the barrel - it will not drill faster!
Do not use too much water.
Clean loose debris from hole regularly.
Note - When drilling laterite the bit may glaze up and need redressing. Do this by reducing the water by half for a few minutes, or by drilling into an abrasive material like limestone, a cinder block or similar. A bit of Ajax or builders sand down the hole can also have the same effect.


Can I use your grinding polishing pads to remove scratches from polished porcelain tiles?
Our polishing pads are for use on natural stones like marble and granite, but also ceramic, concrete and engineered stones.  
The diamond hand polishing pads can be used on small areas, and the diamond resin polishing pads are for use with a polisher for larger areas.
Note - Our diamond resin polishing pads can only be used at a maximum speed of 4500RPM, so use a variable speed angle grinder or a polisher. A fixed speed angle grinder is usually twice as fast as recommended, and pads will deteriorate quickly.
Polished porcelain tiles may have a glossy, polished glaze, ie they are not uniform all the way through like granite, marble etc. Other tiles may have a lacquer finish. Rubbing in one spot (either by hand or with a grinder) may leave an area of hazy finish, ie not the usual gloss finish as the rest of the tile. 
If the scratches are minor, try baking soda, toothpaste, brass polish or Barkeepers Friend to manually remove porcelain scratches. Thoroughly clean the scratch, then apply over the length of the scratch. Buff the scratches with a soft, damp cloth.  After it is thoroughly clean and dry, some people have success sealing the tile by applying car wax to bring up the gloss again. This manual method needs a lot of effort (elbow grease!).
If you wanted to try our pads, we suggest you start with a 3000 grit. If that did not remove the scratches,  try a 1500 grit, finishing off with the 3000 grit. You may need to go as low as 800 grit. Always try first in a inconspicuous spot, and see instructions on each page.

What is exposed aggregate?
Exposed aggregate is a decorative finish that is stylish, durable and easy to maintain. The look is achieved at time of the concrete pour.
Once the concrete has set, the surface is pressure washed to expose the aggregate (rock) underneath.

What is honed concrete?
Honed concrete is like exposed aggregate, but has a smoother matt finish. It is not as polished as polished concrete (see next).
After laying, the concrete needs to set for some time - a general rule is the concrete should be cured for 28 days before you start
Once set, you will need to remove the top layer of concrete to expose the decorative stone aggregates within the mix.
Use our diamond resin polishing pads to achieve the finish the you want.

What is polished concrete?
Polished concrete is a good looking and durable finish that is obtained by polishing a concrete surface with our diamond resin polishing pads until a glossy surface is achieved.

Polished concrete is made by grinding and polishing your concrete until it reaches the desired look.
Next, a process known as hardening occurs, where the use of a hardener penetrates the concrete, creating a chemical reaction to help harden and dust proof the surface.
During concrete polishing, the surface is processed through a series of steps (in general a minimum of 6 grinding steps are completed for it to be considered polished concrete) utilising progressively finer diamond resin polishing pads.

What is "Grind and seal" concrete?
This is where the concrete substrate is ground back (usually to #200 – #400 grit) and then coated with either a polyurethane or epoxy topical coating to give the look of polished concrete without the labour intensive grinding and polishing.


I have lost my machine's operating manual - can you send me one?
All the operating and spare parts manuals we have can be downloaded from here.
You can download our core drilling booklet at the bottom of this page.

What is the correct ratio for making up two stroke oil?
Always consult your saw's handbook first for recommendations.
If you make a fuel/oil mix with too much oil, your engine may be hard to start or run, carbon can buildup on engine internals, it will blow smoke and generally perform poorly. Too little oil in your mix can cause permanent and expensive internal damage and overheating.
The biggest problem we see are incorrect fuel/oil mixes made up on site. For example, some 5 litre fuel cans will hold 5.5 litres. When 100ml of oil is added, a few mils of oil is left behind. The ratio of oil is now too low (almost 60:1). It will not affect the engine immediately, but continual use at this ratio will reduce compression and making starting harder. Similarly, using a cap full of oil per tank of fuel is too inaccurate.
Husqvarna generally recommend 50:1 on their saws (100ml per 5l or 20ml per litre).
Guarda recommend 40:1 (125ml per 5l or 25ml per litre) in their saws.
We have found 33:1 (150ml per 5l or 30ml per litre) is ideal in saws for hire, as it gives low smoke but long engine life.
See Husqvarna's forestry page for some great tips on how to mix two stroke fuel  here.

My two stroke cut quick won't start - what do I do?
Firstly, make sure the on/off switch is in the on position.
If you haven't used the machine for a while, you may need to replace the old fuel with fresh two stroke fuel.
If compression is low (resistance when pulling the starter rope is less than normal), then it is a job for a mechanic.
Similarly, if the blade turns when pull starting, it is another job for your mechanic.
But if it is just flooded, you can try one of these options:
 - Remove the spark plug, pull the starter rope a few times to clear the fuel, then reassemble and try again. Use correct starting procedure (see operation manuals here)
 - Lock the throttle on full (use tape or a cable tie), no choke and pull until it starts. You may need quite a few pulls to clear the fuel, and when it does start, it will be at full revs.
 - Alternatively, Aerostart, Rapid Start etc can be spayed sparingly into the air intake (take top cover off) or exhaust outlet. Use without choke. Refer to their instructions. Again, use sparingly.

Will you ship machinery to the Eastern States or overseas?
No, as freight is too expensive. Let us know what you are chasing, and we can point you to a local supplier in your state.

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We have provide a lot of information on this website, and it done so in good faith and believed to be reliable and accurate at this time.
However, the information is provided on the basis that the reader will be solely responsible for assessing the information and its veracity and usefulness.
UDT shall in no way be liable, in negligence or howsoever, for any loss sustained or incurred by anyone relying on the information, even if such information is or turns out to be wrong, incomplete, out-of-date or misleading.


United Diamond Tools

U9, 84 Barberry Way
Bibra Lake
Western Australia 6163

Telephone: (08) 9434 6878
Mobile: 0419 901 533