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What drill to use on uds

loz

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Hi, I’m building my first ever UDS and want to make a 35mm hole. What drills do people recommend as all the hand drills seem to only go 13mm on steel?
Thanks
 

kilo charlie

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Welcome to SMF!

You need to use a hole saw for that big of a hole - search for 35mm hole saw on google or amazon and find one that's made for steel.
 

loz

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Thanks. Sorry if I’m being stupid here but will a hole saw of 35mm work in a hand drill that only has 13mm capacity for steel?
Do I need a certain type of drill to power the 35mm hole saw?
 

kilo charlie

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Here's a photo of one .. the shank will fit in your drill and give you the size of hole that you need.
 

loz

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Thanks. The guy at the shop said hand drills will only do 13mm wide holes due to the torque in them.
This is great to know, thanks
 

kilo charlie

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The shank on these types of bits are usually around 1/4 inch or 6.35mm so it'll fit in the hand drill
 

loz

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The shank on these types of bits are usually around 1/4 inch or 6.35mm so it'll fit in the hand drill
Thanks. I think the man said because of the torque of hand drills they will only drill 13mm wide into steel.
 

kilo charlie

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Ok.. someone else wanna jump in here? I'm not sure how else to explain this ...
 

Winterrider

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Most hand drills are 3/8" or 1/2" size chuck. Either will easily drill a 3" hole as kilo showed if you need to go that big which I doubt you will. Just drill slowly with very light pressure.
 

chopsaw

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The guy at the shop said hand drills will only do 13mm wide holes due to the torque in them.
Not sure where he came up with that .
13mm is about a 1/2 " 35mm should be around 1 1/8 " . All common for a hand drill . I've used a 5" hole saw on 16 ga. metal . No problem .
Assuming you are drilling a metal drum , get yourself a step bit and drill accordingly .
 

chopsaw

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This should get you in the ball park . Says for wood , but it will drill a metal drum . Just start a pilot hole .

Just for the sake of saying it , Never really seen a step drill used with wood .
 
Last edited:

daveomak

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Why and where are you drilling a 35mm hole ???
 

loz

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Hi all, first of all this is really helpful.
The hand drills all say something like this:
  • Drilling diameter in steel: 10 mm
  • Drilling diameter in wood: 30 mm
  • Drilling diameter in masonry: 10 mm

  • example of one is here
  • amazon" style="max-width:120px">
 

loz

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Just to say this is all sorted now. Thanks for your help, I took this thread to a diy store and they agreed with you all and got me the items.
I think the other two stores saw an amateur and tried to make me spend big.

Thanks again, really helpful
 

chopsaw

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L loz before you drill , maybe answer the question below . I don't use a UDS , but if Dave asked it's probably worth answering .
Why and where are you drilling a 35mm hole ???

I took this thread to a diy store and they agreed with you all and got me the items.
If they set you up with a step bit , drill small first . One down from what you think you need . Can always go bigger .
 

loz

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Joined Jun 19, 2021
L loz before you drill , maybe answer the question below . I don't use a UDS , but if Dave asked it's probably worth answering .




If they set you up with a step bit , drill small first . One down from what you think you need . Can always go bigger .
it’s for the air intakes. I’ve got 35mm wide copper tube that will be going down both sides and into the bottom of the drum, under the coal basket.
 

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