Steel drills question
- Thread starter lovejoy
- Start date
Sponsored Links
HSS Twist drills.
http://www.ebay.co.uk/itm/Dormer-HS...Garden_PowerTools_SM&var=&hash=item1e6c1bab23
Get this type and not the "brad point" type which are for wood.
As big-all says drill a pilot hole first if you're drilling bigger sizes. If the workpiece is small, that is if the torque of the drill would be able to move it, then clamp it down somehow before starting.
Wear eye protection too.
http://www.ebay.co.uk/itm/Dormer-HS...Garden_PowerTools_SM&var=&hash=item1e6c1bab23
Get this type and not the "brad point" type which are for wood.
As big-all says drill a pilot hole first if you're drilling bigger sizes. If the workpiece is small, that is if the torque of the drill would be able to move it, then clamp it down somehow before starting.
Wear eye protection too.
Links in this post may contain affiliate links for which DIYnot may be compensated.
Sponsored Links
How thick is your metal, if you are drilling through thin sheet a piece of wood on the back side will help, if its thick stuff you will need to keep the drill bit cool.
Make sure the metal is held firm, & let the drill do the work.
Make sure the metal is held firm, & let the drill do the work.
the dewalt hss bits are self starting so you dont really need to drill a pilot hole first, remember to go as slow as you can, heat up the bit and it will be USELESS
Sounds like the drill is blunt. A new one should put a 6.5 mm hole through 25mm MS without too much effort. Either sharpen the drill, which needs either a drill sharpener or a grinder and the right technique, or get a new decent quality HSS drill.
A 6.5 mm drill through 1" steel would be ok so long as you are using a pillar drill where you can apply lots of pressure and the speed is low.
If you are using a hand pistol drill (mains) keep the speed low, use a smaller drill first and use plenty of lubrication (WD40, Duck oil will be fine).
Multi use High Speed Drills are often referred to as 'jobber' drills.
John
If you are using a hand pistol drill (mains) keep the speed low, use a smaller drill first and use plenty of lubrication (WD40, Duck oil will be fine).
Multi use High Speed Drills are often referred to as 'jobber' drills.
John
HSS will run very hot while still cutting and holding an edge.
Some of the HSS alloys will still cut when "red hot".
So while it doesn't hurt anything to lubricate the cut it's not strictly necessary unless you are looking for a very fast cut. I used to regularly drill 1/4" holes in steelwork up to about 1/2" using a hand held drill, low speed and not too much pressure. Having a sharp bit is the secret. 1" will just take a bit longer, and a bit more care to keep the drill straight.
Some of the HSS alloys will still cut when "red hot".
So while it doesn't hurt anything to lubricate the cut it's not strictly necessary unless you are looking for a very fast cut. I used to regularly drill 1/4" holes in steelwork up to about 1/2" using a hand held drill, low speed and not too much pressure. Having a sharp bit is the secret. 1" will just take a bit longer, and a bit more care to keep the drill straight.
Some of the cheaper ones aren't worth a monkeys.
Wouldn't drill thru butter.
Dormer, as highlighted in a previous post is one of the better makes.
Wouldn't drill thru butter.
Dormer, as highlighted in a previous post is one of the better makes.
All steel drilling should have coolant applied. If heating is involved then the edge life is shortened dramatically and the tempering is affected further reducing the effectiveness of the bit.
Especially after re-sharpening.
You mean "cut" them selves to pieces.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links
