Shopping List for New BUD Owner

[rikrobson]

The depth of cut will depend on your feed, material and tooling. Set your feed then start a cut. you'll soon see if the cut is to deep or if you can make a deeper one. If this is Al then you can use parrafin or WD40 as a lubricant. Its not a big part, so it won't take that long even with a light cut.

 

[rikrobson]

With a 3 jaw, they are never dead on with a new piece of stock in, but once toy start making cuts it will become as acurate as your lathe is so long as toy don't remove the work piece. Once toy do remove it then you'll need to use the 4 jaw and clock it back in.
I think the best wat is to bore the centre of the part to size, turn the outer diameter then make a mandrel for that to fix to. since the bore and the outer diameter will be concentric and the face perpendicular to the cut axis tuen the part round and attach to the mandrel. This will be concentric to the axis as its been turned. You can then take out the extra metal to the 1" diameter and the relief in the face. This in theory should give you an acurate part

 

[dazza]

I decided to cut as is, The crappy wheels that came with it have the same bore as the spindle but the green wheel has a 1 1/4 inch so i went for 31.75mm and ended up with 31.86mm and it fits nicely. Is 1 1/4 bore a common size?

Edit: It was cutting 0.4mm nicely but on the last cut i had to take 0.12mm and the finish was not as good.

 

[RichardM]

when you mount the grinding wheel put cardboard (cereal box) between it and the washers.

 

[addjunkie]

Ah swarf, bout bloody time

 

[dazza]

I was allowed 10min in the garage today. Tidied up the inside face using a screw cutting tool i ground. Do i need a recess?

 

[rikrobson]

Why is it in the original drawing?
It's probably there to move the clamping pressure out. Make it match the clamping washer. They usually have bevel on them.

 

[dazza]

Why is it in the original drawing?
It's probably there to move the clamping pressure out. Make it match the clamping washer. They usually have bevel on them.

Yep the drawing has a recess of 0.5mm leaving 5.8mm to clamp against the wheel. Is there a simple way to put a stop on the cross slide?

 

[Seadog]

The recess allows for any irregularities around the hole I suppose. Why do you need a stop? A toolmaker's clamp can sometimes be utilised.

 

[dazza]

The recess allows for any irregularities around the hole I suppose. Why do you need a stop? A toolmaker's clamp can sometimes be utilised.

I'm still getting used to whats what a stop would be handy.

if the spindle is 0.5 inch will a 12.5mm drill bit do the job?

 

[Seadog]

I'd be inclined to get it closer than that. For a start, it's unlikely that you'll end up with a 12.5mm hole, it'll be oversize. If it did drill true you're still nearly The ideal would be to bore it and aim for a couple of thou clearance.

 

[rikrobson]

Yep the drawing has a recess of 0.5mm leaving 5.8mm to clamp against the wheel. Is there a simple way to put a stop on the cross slide?

Like @Seadog says why do you need a cross slide stop. Use the micrometer on the feed handle to get the correct size. Or use a dial indicator.

As for the hole. You don't want a 12.5 and hope it's 12.8mm by the time you finish. Half inch is 12.7mm and you will need clearence fit for that application you'll want about .5mm so you'll actually need a 12.75mm hole.. what you actually want is a reamer 1/2 inch plus clearence

 

[Seadog]

Half inch is 12.7mm

Confused the decimal for 1/2" and 1"

 

[dazza]

I got the recess done the wheel does sit better now.

I cant afford to add to my tool collection at the moment. Could i use any of these bits i got from @Hood

 

[Seadog]

Probably not. From what I can see there's an awful lot of grinding ahead of you if you want to make a boring bar from one of them.

 

[dazza]

Probably not. From what I can see there's an awful lot of grinding ahead of you if you want to make a boring bar from one of them.

Just trying to think of a way to bodge this one, at a later date i will invest in some more tooling.

If i drill though with a 12mm.
And grind this tool like pic below would it work?

 

[addjunkie]

Tool steel has two ends

 

[Seadog]

That would work, obviously you're only grinding back enough to clear through the hole

 

[dazza]

Tool steel has two ends

Both grinders are out of action plus have no idea how to grind a boring bar tool.

That would work, obviously you're only grinding back enough to clear through the hole

Yep i will only take a little off the diameter on that side. Thanks again for your help guys.

 

[rikrobson]

You can use square stock for boring. Just make the pointy bit with enough relief to miss the work piece.
Boring is usually over an inch.
You are going to spend a ssh it load of money getting tooling