The mill is in.

[123hotchef]

how do they work?

 

[123hotchef]

Drill out round. Broach to square.

Or get busy with a file.

I have an old scroll saw which can be doubled up as a die filer

oh and it is a blind hole 35mm deep

 

[slim_boy_fat]

YouTube might have something to help, can you drill the hole deeper to allow you to use a square broach. They look to be pricey, but maybe someone here could lend you one?

Not sure, but broaching might be something @doubleboost has covered in one of his SSS video's??

 

[123hotchef]

i could drill the hole deeper yes sure. Can I not just use a thin milling cutter and take the corners off

 

[slim_boy_fat]

i could drill the hole deeper yes sure. Can I not just use a thin milling cutter and take the corners off

Was that what you were trying when you snapped that milling cutter previously? What diameter of cutter would you end up using? As long as the cutter you have has sufficient length on the flutes you probably could. but the 'slot' will always be rounded on the corners, of course.

 

[123hotchef]

what is a wobble broach? https://www.ebay.co.uk/itm/Broachin...233022929623?_trksid=p2385738.m4383.l4275.c10

 

[eLuSiVeMiTe]

what is a wobble broach? https://www.ebay.co.uk/itm/Broachin...233022929623?_trksid=p2385738.m4383.l4275.c10

Seen them used in a lathe tailstock when forming hex holes in fixings. Drill hole to size then bring in wobble broach while the chicks spinning to form the hex/square
Will do a blind hole but needs to be slightly over depth

 

[123hotchef]

Was that what you were trying when you snapped that milling cutter previously? What diameter of cutter would you end up using? As long as the cutter you have has sufficient length on the flutes you probably could. but the 'slot' will always be rounded on the corners, of course.

No I was milling down large T nut the cutter snapped because it came loose due to me not having a spanner to tighten the arbour. I would use the thinnest cutter I have I guess 4 or 6mm, a slight rounding in the corners should be ok I am making a handle for the machine vice

 

[123hotchef]

Seen them used in a lathe tailstock when forming hex holes in fixings.

how do the work though? looks like both bits spin?

 

[slim_boy_fat]

Ah, got you

 

[eLuSiVeMiTe]

how do the work though? looks like both bits spin?

Creates a wobble. Much like wiggling a drill with a blunt holesaw to rotate what corner the broach cuts on

 

[123hotchef]

i got it. not sure tht would be great on bit of bar going that deep

 

[eLuSiVeMiTe]

No I was milling down large T nut the cutter snapped because it came loose due to me not having a spanner to tighten the arbour. I would use the thinnest cutter I have I guess 4 or 6mm, a slight rounding in the corners should be ok I am making a handle for the machine vice

Mines a through hole. No reason it needs to be blind

 

[123hotchef]

Mines a through hole. No reason it needs to be blind

no it does not need to be blind at all. I can easily make it a through hole then square it off

 

[eLuSiVeMiTe]

no it does not need to be blind at all. I can easily make it a through hole then square it off

Mines original if you want pics

 

[123hotchef]

Mines original if you want pics

yes please mate no great rush my bed is calling.

 

[eLuSiVeMiTe]

yes please mate no great rush my bed is calling.

Need to go turn the vfd off anyway. Will post here.

 

[eLuSiVeMiTe]

 

[123hotchef]

Nice one thanks mate. Similar to what I had planned bit of hex bar welded to a handle maybe a old spanner

 

[123hotchef]

Used the mill for milling today. I need more practice.