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View Full Version : Question about eBay diamond hole saws...


Physh1
12/24/2007, 09:56 PM
I was going to pick up a set...I've seen that everyone refers to them as cheap & good. Question is should I expect to be able to drill quite a few tanks with these or will they wear quick? Just trying to figure if investing in a more expensive set would have a better performance lifetime.

Any info would be appreciated...

kgross
12/24/2007, 10:13 PM
I've purchase $50 bits from ameriglass as well as the cheaper bits and I don't think there is a noticeable difference in the usage of either bit.

GuySmilie
12/24/2007, 10:34 PM
For the cost of the Hong Kong bits, what's the difference?
They are so cheap they are almost disposable.

I've used them for many drillings and if you keep them well lubed and don't abuse them, you will easily get your moneys worth.

customcolor
12/24/2007, 11:59 PM
i drilled my 125 with hong kong bits with no prob :)

liveforphysics
12/25/2007, 12:05 AM
I've got at least 15 holes in 3/8th glass with my 2" bulkhead sized ebay cheapy. It still looks and cuts like it did when it was new.

Quality bit or cheapy bit, if you drill with it incorrectly its going to ruin the bit and possibiliy break the glass. The trick is to simply lift off the work every 5 seconds or so with large amounts of water flow to flush the cutting area. If the bit never gets hot and the pressure on the bit remains resonable, any bit will last for a very long time.

iairj84
12/25/2007, 01:01 AM
I drilled 5 holes with both of the bits I got... If you're worried about it then just buy two. They're a lot cheaper than the american made ones and it's not like you're drill 100 holes or something.

aastretch64
12/25/2007, 01:43 AM
Why would you guys spends hundreds of dollars on a tank, and take a chance with some cheap hole saw?!?!?

Alex

kgross
12/25/2007, 09:55 AM
Alex,

This is the DIY forum, we do stuff ourselves here. The Cheap holesaws work as well as the very very expensive ones, so there is no "take a chance with some cheap hole saw"

Kim

Physh1
12/25/2007, 10:04 AM
That's what I was looking for...thanks guys...

walmart
12/25/2007, 10:40 AM
<a href=showthread.php?s=&postid=11453036#post11453036 target=_blank>Originally posted</a> by aastretch64
Why would you guys spends hundreds of dollars on a tank, and take a chance with some cheap hole saw?!?!?

Alex
Yes

Piazzon12
12/25/2007, 01:04 PM
where do you think the expensive hole saws are made??? probably the same place, then labeled with a brand name and a 500% mark up

h20cooled
12/25/2007, 01:11 PM
Like others have said on here the "cheap" hole saws work great, I have drilled probably 20 holes with the one that I use for 1/2" bulkheads and it still works great. The key is to let the bit due the work and keep it wet...

Thats it...

RONCGIZMO
12/25/2007, 01:30 PM
Even if you get 5 or 10 holes out of it...you can"t beat it for the money

BlakDuc
12/25/2007, 03:05 PM
I don't see any "risk" in using the "cheap" bits. Mine has at least 10 holes on it and still cuts like new. $10 shipped vs. $50+tax and shipping, no ? about it.

BeanAnimal
12/25/2007, 06:06 PM
I have at least 10 holes with my cheapy and another half dozen in PEI 5 rated porcelain tile (much harder than the glass) .

dngspot
12/25/2007, 07:35 PM
Got them, work great.

Ontosrob
12/26/2007, 03:29 PM
Has anybody used the holesaw bits with the "centering bit" style like you would use wood holesaws?

h20cooled
12/26/2007, 11:41 PM
never seen any like that, not sure they would work well for glass because you are not cut you are grinding the glass. Plus it would put a lot more pressure on the small point which is NOT good.

Ontosrob
12/27/2007, 12:03 AM
Here is one here: Diamond hole saw w/pilot bit (http://cgi.ebay.com/38mm-Diamond-tipped-hole-saw-core-drill-w-pilot-bit_W0QQitemZ180198881623QQihZ008QQcategoryZ50892QQcmdZViewItem)

I believe the pilot bit is a diamond drill bit as well.

GuySmilie
12/27/2007, 12:06 AM
<a href=showthread.php?s=&postid=11453036#post11453036 target=_blank>Originally posted</a> by aastretch64

Why would you guys spends hundreds of dollars on a tank, and take a chance with some cheap hole saw?!?!?

Alex
:D Because we spent hundreds of dollars on a tank! :D

iairj84
12/27/2007, 01:15 AM
<a href=showthread.php?s=&postid=11462714#post11462714 target=_blank>Originally posted</a> by Ontosrob
Here is one here: Diamond hole saw w/pilot bit (http://cgi.ebay.com/38mm-Diamond-tipped-hole-saw-core-drill-w-pilot-bit_W0QQitemZ180198881623QQihZ008QQcategoryZ50892QQcmdZViewItem)

I believe the pilot bit is a diamond drill bit as well.



Do NOT buy the ones with the pilot bits, they're worthless. I ended up not being able to use them as they make the bit chatter on the glass too much... My only reccomendations is to keep the vibration off of the glass.. the best way I found to do it was to cut a hole in a piece of 3/4'' mdf of ply wood (doesn't matter much) and drill a hole with a hole saw the same size as the diamond bit. Then clamp it tightly to the glass and add the water in there. The bit will have no where to chatter and vibrate the glass and it also keep the bit wet as a damming method....

Worked really well for me. use at your own risk :D

Ontosrob
12/27/2007, 01:27 AM
Thanks alot! Appreciate the good advise!

draleigh
12/27/2007, 07:04 AM
i agree with all those who have bought and used the cheapo's. I two have bought the cheap ones and mine are still like new. I drilled 4 holes in my 180 gallon with them, then holes in my 30, 20L, and about to drill my friends 55 all with the same bits. They work fine. As stated, go slow, use lots of cool water to keep the bit cold.

hllywd
12/27/2007, 08:02 AM
<a href=showthread.php?s=&postid=11459716#post11459716 target=_blank>Originally posted</a> by Ontosrob
Has anybody used the holesaw bits with the "centering bit" style like you would use wood holesaws?

I have a carbide saw I use for water and gas lines through tile, never tried it on glass....

This is what I use for glass, dirt cheap, great customer service, and I've drilled 20 or so holes with the 45mm one.

Tim:cool:

BeanAnimal
12/27/2007, 10:45 AM
The carbide saws will not work for glass or porcelain... you need diamond :)

BeanAnimal
12/27/2007, 10:45 AM
The carbide saws will not work for glass or porcelain... you need diamond :)