Any Metalworkers out there

[JonnyD]

Hi I am wondering if anyone with some metalworking skills/gear would be intersted in a small project. I am after a bush to fit my pillar drill to facilitate the use of jigs for accurate drilling.

The drill is a Wadkin LM

There is a machined hole with a lip where the bush needs to go. The table goes up and down on slideways so the hole is always directly in line with the drill.

I have a set of guidebushes that i dont use that may be able to be converted. The outside is only fractionally bigger than the recess.

The recess is 66mm diameter and 8.5mm deep. The options i can see working are spinning down the guidebush I already have to 66mm. Maching a new 66mm plate to take the internal guide bushes or forgetting the guide bush idea and maching one from scratch.

Any ideas suggestions appreciated.

Jon

 

[dicktimber]

I am not sure I understand what exactly you want?

How do you perceive that a bush will facilitate accurate drilling, and how are the jigs going to fit into the equation?

If you could show some sketches of what you want making and how it would work, I am sure you would have a better response, for either someone to help or point you to an engineering toolroom.

Mike

 

[AndyT]

If nobody offers, you could try this outfit: http://www.emachineshop.com.

You draw the object you want in their CAD software, and they machine it in whatever material you want.

Andy

 

[JonnyD]

I am not sure I understand what exactly you want?

How do you perceive that a bush will facilitate accurate drilling, and how are the jigs going to fit into the equation?

If you could show some sketches of what you want making and how it would work, I am sure you would have a better response, for either someone to help or point you to an engineering toolroom.

Mike

Basically I want a raised pin guide bush in the centre of the hole in the table. A jig which will be attached to the workpiece will have a hole in it that will drop on top of the guidebush and allow a hole to be drilled in exactly the same place on every component. It is pretty much the same principal as a router guidebush.

Jon

 

[JonnyD]

If nobody offers, you could try this outfit: http://www.emachineshop.com.

You draw the object you want in their CAD software, and they machine it in whatever material you want.

Andy

Hi Andy

Have you had anything made by them?

Jon

 

[CHJ]

Jon, no problem turning one up for you if I have suitable bar or plate stock 66+mm dia, will check tomorrow, would a hardwood insert with steel pin be accurate enough?

 

[JonnyD]

Hi Chas I was thinking of a metal or plastic one rather than hardwood but I dont see why it cant be hardwood?

I will take some accurate measurements tommorow and PM you.

Thanks

Jon

 

[jhwbigley]

can't Roger Nichols do it?

id try turning down the bush adaptor down, as trying to make a new plate with the thread to fit the guide bushes could be a bit difficult. unless a hardwood block and a brass/steel pin could work?

John

 

[jhwbigley]

(note to self, type faster! #-o )

 

[JonnyD]

Hi John

I didnt think of Roger.

My initial thoughts was that the easiest option would be to turn down that guide bush adapter. I have about 8 different bushes for it so it would be pretty versatile.

Jon

 

[jhwbigley]

i just don't know how you would get it mounted on the lathe. are those american bushes? are they imperial?

John

 

[JonnyD]

Hi John they are imperial yank spec.

I dont know whether you could mount a bush in the adapter put this in the chuck and turn it or whether the lock nut would work loose.

Jon

 

[FatFreddysCat]

Sorry if I've got the wrong end of this, but why not remove the fence and attach a sacrificial MDF/plywood worktop which can be drilled to accept a dowel pin? We have our pedestal drill set-up with an auxilliary plywood top which in turn accepts several different auxilliary "sub-tops" which always locate in the same position when attached. This includes a couple of different tops for hinge hole drilling and one for drilling shelf pin holes

 

[JonnyD]

Sorry if I've got the wrong end of this, but why not remove the fence and attach a sacrificial MDF/plywood worktop which can be drilled to accept a dowel pin? We have our pedestal drill set-up with an auxilliary plywood top which in turn accepts several different auxilliary "sub-tops" which always locate in the same position when attached. This includes a couple of different tops for hinge hole drilling and one for drilling shelf pin holes

I had thought about doing it that way I just thought having the bush setup might be easier and I wouldnt have to keep taking the fence on and off.

Jon

 

[jhwbigley]

might crush the guide bush if the chucks tightened to much. failing that using a face plate, and bolting it to that through the 4 holes, and centre in by using a guide bush and the tailstock center.

John

 

[CHJ]

Don't make hard work of it fellas, if all that is needed is the ally bush housing turning down it's no problem to anyone with a metal lathe, in fact being ally it can be done by anyone with a wood lathe fitted with a scroll chuck and ordinary HSS wood working tools.

You just turn up a mandrill to suit the bore and clamp the bush in place with a bolt and washer.