Power Drill

[Joe_P]

Hi Guys,

Jus wondering if there are such power drills available that can rpm control....

Need it for drilling acrylics so would need something slower...

[clowntrigger]

You can use those hobby drill like Dremel or minicraft which has a variable speed. This tool are meant for hobby used, thus if you are thinking of drilling large hole, then this is out of question..

[mv3i]

get black n decker ....

[Joe_P]

get black n decker ....

I have a black and Decker but its single speed... acrylics are bound to crack...

and I'm using it to drill 9 mm diameter holes... so miniature drills are out......

[ah wa!]

Those cordless drills have a lower rpm and are suitable for drilling acrylic but best to get a power drill with continously variable speed instead of those 2 or 3 preset speed kind. Use a grinding stone to de-sharpen the tip of the drill bit so that it drill by "scraping" action instead of "slicing" action, this will greatly reduce the chances of the drill bit "grabbing" and cracking the acrylic.

[BarraCudaTM]

wet and drip water on the acrylic when you drill

[Tanzy]

Actually, most drills come with a pressure controlled switch for variable speed control.

[Ian]

Tanzy is right, most do come with speed control. Don't forget to get drill bits for acrylic or it will crack! One way is to modify the drill bit for acrylic use.

[Joe_P]

Tanzy is right, most do come with speed control. Don't forget to get drill bits for acrylic or it will crack! One way is to modify the drill bit for acrylic use.

Drill bits for acrylic?? Modify??

How do I do that???

I'm actually holding on to one of those cordless drill but they can't hold a 9mm drill bit ....

Btw, to get a 9mm hole, is it safer to drill a smaller hole so as to guide the bigger drill bit in......???

[shiraz]

hmmmm.. how OLD is your drill?!

they have separate drill bits for different materials actually...

and ya it's safer to drill a smaller hole then use that to guide the bigger drill bit in... smaller surface area = higher pressure = less change of movement = more accuracy

[Ian]

Are you gonna drill a flat acrylic or cylinder?

If your gonna use this drill bit size alot, then i recoment that you get a hole saw at that size. I will cost you more but in the long run it's better. I got 3 sizes for PVC plumbing sizes. 16mm, 20mm and 25mm. For your "Future Plans" you should get a proper drill. Take it as an investment.

[Joe_P]

Are you gonna drill a flat acrylic or cylinder?

If your gonna use this drill bit size alot, then i recoment that you get a hole saw at that size. I will cost you more but in the long run it's better. I got 3 sizes for PVC plumbing sizes. 16mm, 20mm and 25mm. For your "Future Plans" you should get a proper drill. Take it as an investment.

Is there a hold saw for size 9mm ???

How much would a hold saw cost me??

[Ian]

Sorry I just realised that 9mm is too small. I don't think they have one for that size. Sorry.

File the corners of your drill bit. Not the Tip!

[Joe_P]

Sorry I just realised that 9mm is too small. I don't think they have one for that size. Sorry.

File the corners of your drill bit. Not the Tip!

Fil;e the corners....???

ain't drill bits hardened carbonic steel???

Pls share... cos I'm alittle lost...

[ah wa!]

You can use those grinding stone used for sharpening kitchen knife to de-sharpen the "tips(look at the side view) of the cutting edges" as shown on the diagrams below.

Below is the rough sketch of the side view of the cutting edge before modification.

and the edge after de-sharpening.

[alvy]

Are you gonna drill a flat acrylic or cylinder?

If your gonna use this drill bit size alot, then i recoment that you get a hole saw at that size. I will cost you more but in the long run it's better. I got 3 sizes for PVC plumbing sizes. 16mm, 20mm and 25mm. For your "Future Plans" you should get a proper drill. Take it as an investment.

hehe..Ian..

very true indeed to have assorted drill bits and hole saw sizes for all "purposes"..

i have all sizes all the way to even a 6" hole saw! actually drill bits aside, the most important thing to have is a proper clamp system..flat surfaces are simple job..round surfaces require a good clamp in place so you'll get perfect drills which will warrant leakfree joints! For precise drilling on round surface, it is important to do slow drilling into the acrylic surface to prevent cracks..our acrylic tubes from local suppliers are usually extruded acrylic...very low density..very brittle..they crack very easily unlike cast acrylic tubes..

Forget normal handrills, GET A DRILL PRESS..perfect perpendicular drills!!

[Joe_P]

Drill Press??? Dun think I can afford them and also find space to house it....

Only drilling on flat acrylics........ so a Hand Drill should be enough....