Centre drilling on a Myford Super 7

[Chris Richards 3Participant @chrisrichards3]

Hello,

I am new to the forum and have just bought a Myford Super 7 which I was hoping would replace my slightly worn Boxford. I have noticed the spindle bore is really small on the Myford so the question is how could I accurately centre drill 20mm round bar 240mm long?

Maybe sounds a daft question but I was used to placing bar through the spindle and only have about 10mm exposed from the chuck to dial it into centre and then drill.

Any suggestions/ advice would be great otherwise I'll have to trade the myford for something slightly bigger.

Thanks,

Chris

[Chris Richards 3Participant @chrisrichards3]

Centre drilling 20mm diameter long bar that won’t fit through the mt2 head

[David ColwillParticipant @davidcolwill19261]

The usual way would be to use a fixed steady but if you have to do this regularly it would be a bit of a faff.

Regards.

David.

[Brian WoodParticipant @brianwood45127]

Hello Chris

This works well with the appropriate accessories. Length and diameter [within reason] are not a problem

Regards

Brian

Edited By Brian Wood on 16/09/2014 10:15:04

[Harold Hall 1Participant @haroldhall1]

Again I would suggest a look at my web pages on using a fixed steady, as per David's method. Look here for the appropriate page,

Harold

[Chris Richards 3Participant @chrisrichards3]

Thanks for the reply's it looks like a steady is an essential part for the Myford that I don't yet have.

[NobbyParticipant @nobby]

HI Richard & Guy's
I needed a fixed steady for a job on my S7 . So i made a simple one and it works well
Nobby

[NJHParticipant @njh]

Chris

You could make your own – see HERE

You will need a facility for milling but otherwise it's pretty easy.

Norman

[john kennedy 1Participant @johnkennedy1]

A quick and dirty solution is to clamp a chunky piece of wood to the cross slide and drill/bore to bar size from the head stock. You can always slit it to the center with a couple of screws to clamp it.

Seeing as you are only centering there will be little or no radial load.

Will do for a one off job.

[steamdaveParticipant @steamdave]

Posted by Brian Wood on 16/09/2014 10:13:40:

Hello Chris

This works well with the appropriate accessories. Length and diameter [within reason] are not a problem

Regards

Brian

Edited By Brian Wood on 16/09/2014 10:15:04

Like that idea, Brian.

Dave
The Emerald Isle

[Brian WoodParticipant @brianwood45127]

Hello Dave in the Emerald Isle,

Thank you, but the idea isn't really that novel. It was a furniture commission job, the bars were 16mm grade 304 stainless steel 800mm long, to be drilled and tapped M4 at one end, there were I think 12 such bars to do.

It worked very well, the steady at the tailstock end was only there as a loose support, all the thrust for drilling came from the X slide. Setting up was a doddle using the co-axial indicator which allows viewing from one side over a full rotation around the work. It had been a christmas present to myself the previous year. I did test it against the more traditional method with a finger DTI, using a mirror to view the difficult sides; there was really no contest.

Regards

Brian

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