What are you machining?

[mtt.tr]

Nothing exciting had to drill some 316 bushes for the poly bushes

100mm depth 12mm dia

Much in the vein of @grim_d cheap carbide insert post these are cheap hss drills ground with a 6 facet point which makes them pretty chip resident


Had adapt the boring bar Holder to take er25 collets makes peck drilling possible and keeping the pressure on

 

[doubleboost]

This volvo manifold had warped after some serious welding mods
After a bit of head scratching i came up with this set up

 

[zx9]

Right old set up there John.

 

[mtt.tr]

Something from the bin, about 4 months ago i collected a bag of machine parts and tooling I've collected over about 12 years maybe little longer.

At the bottom of this bag was a very abused thread gauge threads all knocked of and 16 tpi stamped on it. Puzzled i realised it was the first proper thread i cut i was about 13-14 that's now 13 years ago i was doing an internal thread for something i couldn't remove the shaft so cut an outside external thread to use as a gauge.

This would of been hand ground hss tooling, not sure how i ended up a cabinet maker/carpenter




Better late than never to share, as far as i know the other part is still in use lost contact with them a long time ago

 

[mtt.tr]

I've had a win with poly

Ive made a number of custom poly bushes covers my small weekly rent and today ive finally cracked boring them, or what should be coring them.

Using the centre bush that will hold them cut a couple of teeth plunge in. Creates a perfect tight fit

 

[grim_d]

127T gear made again, went perfectly this time.

Still rings like mad, need to start adding sound deadening.

 

[fizzy]

127T gear made again, went perfectly this time.

Still rings like mad, need to start adding sound deadening.

View attachment 228007

Do you have any pics of the setup? I assume you used a dividing head?

 

[grim_d]

Do you have any pics of the setup? I assume you used a dividing head?

Post #684 shows the setup on the last attempt, yep a dividing head with a compound gear train.

The only changes I made this time were some items to increase rigidity during the cut, the blank was pressed against the chuck jaws and was g-clamped to the chuck also, helped enormously.

 

[fizzy]

Post #684 shows the setup on the last attempt, yep a dividing head with a compound gear train.

The only changes I made this time were some items to increase rigidity during the cut, the blank was pressed against the chuck jaws and was g-clamped to the chuck also, helped enormously.

Very nice - what size/make dividing head is that?
What are you using the gearing for? I thought that was only for spiral/helical stuff?

 

[grim_d]

Very nice - what size/make dividing head is that?
What are you using the gearing for? I thought that was only for spiral/helical stuff?

It's a 9.5" Victoria, I've got a riser plate to make it 10" though. I paid through the nose for it because it came with all its accessories.

In addition to spiral milling the gearing allows you to divide anything up to about 380 iirc with only the two hole plates. It rotates the plates with the spindle effectively giving you more hole circles. I don't believe there's any other way to do 127T unless you direct index?

 

[fizzy]

It's a 9.5" Victoria, I've got a riser plate to make it 10" though. I paid through the nose for it because it came with all its accessories.

In addition to spiral milling the gearing allows you to divide anything up to about 380 iirc with only the two hole plates. It rotates the plates with the spindle effectively giving you more hole circles. I don't believe there's any other way to do 127T unless you direct index?

I bet you did pay a fortune for it. Very nice though.

 

[Agroshield]

Using the centre bush that will hold them cut a couple of teeth plunge in. Creates a perfect tight fit.

I have just seen a similar concept in Ian Bradley's Myford book for cutting rubber hose: clamp a single-edged razor blade into a block of steel and slice it. Plain water as a lubricant. Maybe this could be useful to you in the other direction.

 

[Kram]

Still rings like mad, need to start adding sound deadening.

You'll have to do it again in delrin

I imagine a couple of face grooves filled with plastic/epoxy/rubber could absorb any ringing?

 

[grim_d]

You'll have to do it again in delrin

I imagine a couple of face grooves filled with plastic/epoxy/rubber could absorb any ringing?

If it wasn't for the cost I probably would have, in fact now I know how easy it is I might be willing to buy a bit.

Yeah I was thinking that but one of my buddies has some self adhesive sound deadening I'm going to try first.

Edit: just checked, about £35 for a bit, not terrible.

 

[grim_d]

I self adhesive sound deadening I'm going to try first.

Worked a treat, ringing completely gone.

It shown up another noise somewhere though but one thing at a time.

 

[pressbrake1]

View attachment 226618 View attachment 226619 This volvo manifold had warped after some serious welding mods
After a bit of head scratching i came up with this set up
View attachment 226616 View attachment 226617

Looks like it’s been modified for more than doubleboost!
Sorry not funny

 

[pressbrake1]

127T gear made again, went perfectly this time.

Still rings like mad, need to start adding sound deadening.

View attachment 228007

Need a price to make a 127 for my Holbrook if you’re interested?

 

[pressbrake1]

Quick set of lifting eyes for the devlieg.
I wanted full thread depth as specified and standard eye bolts are less than 2x diameter.
1 1/4 whit

 

[grim_d]

Need a price to make a 127 for my Holbrook if you’re interested?

Could be, favours for favours rather than any money exchanging hands I'd say though. What's the DP and pressure angle as I only have DP14 cutters, though cutters are pretty cheap.

 

[pressbrake1]

Big shock it screwed in ok