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Member postings for JasonB

Here is a list of all the postings JasonB has made in our forums. Click on a thread name to jump to the thread.

Thread: Bright EN24T steel vs Black EN24T for cutting gears
10/10/2019 13:24:01

Ah I was thinking along the lines of HPC, Duval etc. I suppose a jobbing shop would use Involute cutters for a one off, would really depend on what equipment they have as it may be cheaper to sub it out.

As for hobbing a modern machine will drive the blank independantly by electronic means no need for gear trains so no need to run a particular way to get started unlike free hobbing and they seem to use climb cutting too. Though you probably won't find many bodging lodges with something like this.

10/10/2019 11:57:34

Adam, read my reply again, it is teeth ON THE CUTTER not the gear

10/10/2019 11:52:43

That seems quite a lot of teethquestion

I would have expected about 12, have you got a picture or link as teeth would be very thin

 

Edited By JasonB on 10/10/2019 11:54:39

10/10/2019 11:46:29

Multiply RPM x number of teeth on the cutter x 0.004" and that will give distance per minute feed.

Thread: Victoria 7" flywheel on a 7x12 lathe?
10/10/2019 11:29:32

Would not worry about any crust if present using inserts, 10thou should be OK but I'd be at about 400rpm

10/10/2019 11:16:12

Neil has had a few big lumps of CI on his so flywheel should be OK. To get the best of the motors power go for carbide inserts, reasonable speed and light cuts rather than slow and deep.

Edited By JasonB on 10/10/2019 11:18:07

Thread: Bright EN24T steel vs Black EN24T for cutting gears
10/10/2019 11:02:32

NDIY, commertcial gear cutting is unlikely to be done with involute cutters.

Michael, Bright would need more rolling/drawing or may be supplied as peeled both processes would add to the cost.

I have generally found that Black is cheaper than Bright whenever I have bought steel, Don't know where Adam is getting his from but as an Example 300mm of black 105mm dia for £45 vs. 300mm of bright 100mm dia for £83 would seem to confirm that, even their 130mm black is cheaper than 100mm bright. What do you normally pay for it?

Thread: Warco WM18 milling head shake ( technically spindle is precessing) when plunge milling a blind slot.
09/10/2019 12:22:54

I can't speak for Warco but ARC certainly advise putting on a cut with the quill fine feed not the head height handle, why else would the built in digital readout be fitted to measure the fine feed, the head only gives a coarse reading.

Also not good from a safety point of view to be reaching up over a rotating cutter to make adjustments.

Was it one of ARC's premium cutters or the basic Gold Tin coated ones? if the gold then I'm not too keen on those.

I just popped a 6mm 2-flute standard length premium HSS cutter from ARC into the SX2.7 as that is the nearest I have to your cutter, did two plunge cuts one with fine feed and the other with head feed and no real difference in the holes produced, head feed did feel a bit more like things were moving about but that could just as easily have been the lack of control of the feed. I then cut between and beyond the two 2mm deep plunged cuts and in both cases no sign of the plunge cuts being oversize. Red marks are where I plunged

20191009_121109[1].jpg

Edited By JasonB on 09/10/2019 12:30:39

Edited By JasonB on 09/10/2019 12:31:30

Thread: What are members thoughts on Gap Bed lathes ?
09/10/2019 11:48:57
Posted by Hopper on 09/10/2019 10:44:34:
Posted by JasonB on 09/10/2019 07:33:22:

For a moment there I thought you were describing a Myford 254. Just look at that even higher base to the tailstock and the unsupported overhang of the topslide.

Ah, but Myford have cunningly incorporated a threaded feedscrew fitted with a right-angle crank handle into the topslide. By manipulating the crank handle in an anti-clockwise direction, the astute operator can move the position of the topslide to such an extent that overhang is reduced to nil, or even less.

The Warco must have copied that novel feed screw idea as you can do the same with theirs except it has less overhang than the Myford at either extent of travel. smiley

What Myford forgot to do is notch out the saddle which means any large diameter work requires the topsilde to overhand if you are going to avoid the work hitting the carrage first. On my 280 and Daves 250 you can swing the full quoted diameter and get that right up against the side of the cross slide, looks like you loose 40-50 on the Myford 254.

09/10/2019 07:33:22
Posted by Hopper on 08/10/2019 12:24:38:

The WM250 is in effect a gap bed lathe. The bed just continues along at the lower level of the gap whereas the Myford bed rises up that inch or two at the end of the gap. That is how the WM250 can swing a 250mm diameter job over the bed,

To make up for this, the WM250 has the tool bit perched way up high on top of a thicker carriage, cross slide, top slide and tool post.Same with the tailstock perched up on a thickened base. Thus introducing the added flexing and chattering in these areas that the Myford does not have.

For a moment there I thought you were describing a Myford 254. Just look at that even higher base to the tailstock and the unsupported overhang of the topslide. Still does not stop the majority of Myford fand lusting after onedevil

Edited By JasonB on 09/10/2019 07:35:39

Thread: Bright EN24T steel vs Black EN24T for cutting gears
09/10/2019 06:59:08

You can pickle the bar to get rid of the scale, 1hr in brick cleaner will see it all drop off.

Less processing of teh black bar makes it cheaper.

Thread: Electric Traction Engine
09/10/2019 06:56:30

Or you could do as Fowlers did and put a neck bush into the hole in the cover, a dummy gland solidly fitted would have a similar effect.

neck bush.jpg

Thread: What is the way to put these holes in the right place?
08/10/2019 20:29:40

what do you think of the deluxe block, acute & obtuse angles and a vertical face directly above the corner for the mathmatically challenged who can't add/subtract 10 or those who work in imperial.

jbblock3.jpg

It's not your royalties I'm worried about, it's Ketan's cut that's the problemdevil

08/10/2019 20:04:14

Rods also need to fit into a Vee to be of any use.

MK2 JBBlock. 20 x 20 would make it easier to just knock 10mm off the indicated edge, hole will clear a burr thrown up in either direction.

jbblock.jpg

08/10/2019 19:41:17

Don't need to go wasting metal making L shaped jigs when you have a pair of Uncle Ketans blockswink

photo 142.jpg

Or the little jig I mentioned above

45deg.jpg

08/10/2019 19:24:54

You could always make up something like this which would then give a vertical edge to touch off against, two slitting saw cuts across a bit of say 1" wide material should do.

08/10/2019 19:16:56

If you make the cut so that the material is being cut in from the edge rather than cut out over it the burr should be minimal, and even if taken off with a stroke of a fine file will only make a thou or two difference which is less than you are likely to get eyeballing a scribed line.

08/10/2019 18:35:30

With the work held at 45deg, machine the end then touch the acute angled edge with an edge finder and move the mill in by the required amount

Edited By JasonB on 08/10/2019 18:35:41

Thread: Fly wheel size
08/10/2019 18:32:00

Ah one of Julius' enlarged copies that he has doubled up the sizes of the original Kerzel. Most of his drawings take no account of the scaling factors so a 150mm flywheel of say 40mm rim width by 25mm thickness would do and up the central web thickness to 12mm for good measure.

M-Machine do 180mm cast iron or 7" EN1A by the inch but cheaper and better looking to get a couple of the 7" part machined flywheels from RDG

Thread: Warco WM18 milling head shake ( technically spindle is precessing) when plunge milling a blind slot.
08/10/2019 16:16:23

You can also help the machine buy drilling say a 6mm blind hole so the slot drill can plunge more easily as there is no slow rotating "dead spot" in the middle or ramp down into the slot rather than plunge.

What make were the cutters you tried? What was the material being cut?

Edited By JasonB on 08/10/2019 17:03:44

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