Drilling thick cast iron plate

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Distorted Vision
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Drilling thick cast iron plate

Post by Distorted Vision »

I bought a Bosch GBG 35-15 bench grinder and a Draper Draper 69356 Bench Grinder stand.

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Unfortunately only the front two holes align with the plate of the stand. The plate is cast iron and 14mm thick. I was wondering if I can use a bench drill like this Scheppach one to drill holes:

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It will be a good excuse for me to buy one as I've wanted one for some woodwork projects I've been considering.
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Drilling thick cast iron plate

Post by kellys_eye »

Distorted Vision wrote: Tue Oct 12, 2021 6:33 pm It will be a good excuse for me to buy one
If you need an 'excuse' (is Mrs watching? :lol: ) then yeah, it's a great idea and will pay for itself in a week or so.

If you only want the odd hole - even in 14mm cast steel - then a decent battery drill will do that. I've just drilled four holes in 10mm thick galvanised steel girders using a 6mm pilot followed by a 10mm bit using an Erbauer battery portable. T'was a breeze.
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Drilling thick cast iron plate

Post by Rorschach »

A cordless drill would do it fine, just take it slowly but a pillar drill will certainly handle it with no trouble.
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Drilling thick cast iron plate

Post by Distorted Vision »

Great thanks - just ordered. The Scheppach DP19VARIO is £239.99 on eBay from scheppach-direct with discount code: FALL20 but ends midnight tonight.
I bought a Scheppach Brush Cutter from Aldi a few weeks ago for £46 and was pretty impressed with it.

Also ordered a Irwin M42 Cobalt HSS drill bit set.

Christmas has come earlier for me!
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Drilling thick cast iron plate

Post by kellys_eye »

Distorted Vision wrote: Tue Oct 12, 2021 8:28 pm I bought a Scheppach Brush Cutter from Aldi a few weeks ago for £46 and was pretty impressed with it.
Yeah, I got one of those about a year ago - dog's doo dah's. Powerful, runs well, even survived winter storage with fuel in it!
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Drilling thick cast iron plate

Post by Grendel »

Can't help thinking that this question is basically about justifying buying a pillar drill than anything else. If faced with this problem , that of drilling a couple of holes , options would be 1 use a piece of ply inbetween the plate and the bench grinder , 2 new drill bit for a couple of quid and in whatever drill you already have or 3 £240 for a pillar drill. Seems to me the last option is overkill for two holes.
I have a friend who posts on here occasionally with the user name of Bourbon. He brought a pillar drill a few years ago and has found it a useful tool. It is an Axminster model and he brought the radial pillar drill but in retrospect wishes he hadn't brought the radial model. Firstly they take up a huge amount of space and secondly he was finding that at full extension the bed was flexing and causing problems. He now just uses it as a fixed pillar drill which has cured the flexing issue although he has had to live with the space issue.
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Drilling thick cast iron plate

Post by Distorted Vision »

It kind of is but I've wanted one for some other projects I had in mind for a while. I'm not just buying it to drill these two holes.

I'm not sure how the piece of ply that you suggested would work.
Grendel wrote: Wed Oct 13, 2021 7:24 am Can't help thinking that this question is basically about justifying buying a pillar drill than anything else. If faced with this problem , that of drilling a couple of holes , options would be 1 use a piece of ply inbetween the plate and the bench grinder , 2 new drill bit for a couple of quid and in whatever drill you already have or 3 £240 for a pillar drill. Seems to me the last option is overkill for two holes.
I have a friend who posts on here occasionally with the user name of Bourbon. He brought a pillar drill a few years ago and has found it a useful tool. It is an Axminster model and he brought the radial pillar drill but in retrospect wishes he hadn't brought the radial model. Firstly they take up a huge amount of space and secondly he was finding that at full extension the bed was flexing and causing problems. He now just uses it as a fixed pillar drill which has cured the flexing issue although he has had to live with the space issue.
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Drilling thick cast iron plate

Post by Grendel »

Bolt the ply to the bench grinder and then bolt the ply to the stand . You're only drilling holes in ply then not in cast iron. Easy as pie really
Still it wouldn't hurt to have a pillar drill .
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Drilling thick cast iron plate

Post by dewaltdisney »

I bought my drill press for £40 years ago and I see it is only £70 at Screwfix now https://www.screwfix.com/p/energer-enb6 ... 240v/1009j It has given good service and I do not think it has been defeated by anyth job I wanted to do.

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Drilling thick cast iron plate

Post by etaf »

i like your style and thought process, my son-in-law does the same, on any DIY project, always need some expensive tool or another....., which is very often unnecessary , but justified on the immediate project and other uses , but he's a bit of a tool junky.
@dewaltdisney not to steal the thread, But are you very happy with that screwfix pillar drill, i was looking at that over the weekend with the 10% off , but not happy with some of the reviews
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Drilling thick cast iron plate

Post by dewaltdisney »

Well the only issue I had was the micro switch in the top cover switching it off with vibration. A bit of lid bending seemed to cure it. Other than that, I chucked the guard, it has worked perfectly. There is a pully arrangement to change speeds by shifting the belt and this seems to accommodate most requirements. As I say for £40 at the time it was a bargain

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Drilling thick cast iron plate

Post by Chippo1 »

Just one thing , when drilling cast iron do not use any form of lubricant as it is effectively self lubricating with a certain amount of carbon and graphite present depending on the mix, the swarf / dust lands up like concrete if you put water based lubricants any where near and oil based results in goo!

You can also hit very hard spots at the surface of the cast iron , but usually it’s easyier to drill than mild steel.
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Drilling thick cast iron plate

Post by Distorted Vision »

Thanks for the tip!
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Drilling thick cast iron plate

Post by Rorschach »

Grendel wrote: Wed Oct 13, 2021 7:24 am Can't help thinking that this question is basically about justifying buying a pillar drill than anything else. If faced with this problem , that of drilling a couple of holes , options would be 1 use a piece of ply inbetween the plate and the bench grinder , 2 new drill bit for a couple of quid and in whatever drill you already have or 3 £240 for a pillar drill. Seems to me the last option is overkill for two holes.
I have a friend who posts on here occasionally with the user name of Bourbon. He brought a pillar drill a few years ago and has found it a useful tool. It is an Axminster model and he brought the radial pillar drill but in retrospect wishes he hadn't brought the radial model. Firstly they take up a huge amount of space and secondly he was finding that at full extension the bed was flexing and causing problems. He now just uses it as a fixed pillar drill which has cured the flexing issue although he has had to live with the space issue.
If the bed is flexing he needs to add a jack for support. Radial drills are a bit specialist really and not worth getting a cheapy.
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Drilling thick cast iron plate

Post by Grendel »

Yes a Jack would work , or even for that matter a length of timber propping it up. Saying that , if you were to see his workshop finding the floor under the drill to stand said jack on would be another issue...😊😊
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