Member postings for Ross Lloyd 1

I missed off the quantities of each. Per line above: 1, 3, 2, 1, 1, 2

8.7Nm is for a potential 4th axis

Ross

Hi Murray!

They do sell ballscrews, which again made me wonder. Maybe they were going for a minimal / low cost build, I don't know. This is the full listing:

Stepper Motor 8.7Nm Nema34
Stepper Motor 4Nm Nema23
Digital DSP Stepper Driver 5.6A, 50V CWD556
Digital DSP Stepper Driver 7.2A, 80VDC or 60VAC CWD872
Breakout board KK01 CNC Stepper Motor 5 Axis with Relay
600W PSU 48V 12A CNC Power Supply Stepper Motor Milling

£580 inc vat and postage. Good deal or no?

Cheers

Edited By Ross Lloyd 1 on 29/06/2018 22:59:31

Thats quite reasonable. Did you look into 4th axis chucks (not sure if right term) by any chance? £200 seems to be about the going price but I am not sure if that should include a motor or not.

Thanks Martin I will have a look at that site

Thanks Martin I will have a look at that site

I do have those issues, which is the reason I am asking. It seemed odd to me that the company would not recommend ballscrews, and the replies are confirming their usefulness. If they can be bought cheaply online then thats not a massive issue.

Hi

Anyone with experience of converting a WM18 mill to CNC know if its needs ballscrews? I have got a quote for a conversion kit but it seems they are suggesting I just use the existing lead screws. Does it not require ballscrews due to the backlash?

Cheers

Hi Jason

It is throwing it away, but it feels like from time to time some of the chips get caught or go under the tool, which results in the swarf rubbing on the face. You can feel a clear grinding sensation through the handwheels. Is it possible this is just because I do not have the cross slide locked? This only happens with the index tool, which has a much smaller nose radius than my ground tool. The latter cuts really nicely now.

Will try to get some shots too.

Hi Mick

Thanks for the reply! Can you explain what you mean by checking it over a full range of movement? The cross slide just has a single allen bolt that you tighten. Should I expect it to have more play at different points along its length?

Cheers!

Hi all

Lathe is a Warco WM250V, manufacturer recommends and supplies 12x12mm tools for it.

Material is EN1A Mild Steel. At 40mm diameter I started with the book-recommended 300 rpm, but this produced an awful cut. Increasing to 600 cleaned it up enormously. I have been slowly increasing to 1000+ once down to diameter which for this beginner project, designed to give you a lot of experience of just taking metal off (hence large starting diameter), is 12mm. That was with the original HSS tool, which when reground produced a lovely finish.

Feeds I do not yet have a concept of how to gauge if hand feeding, I am just going with a constant pressure and no "I really don't like this" noises.

Speeds have been the same for the new index tool with cabide, so I need to:

1) Higher speeds if using the Carbide

2) Locking the cross slide no matter what the tool

I will try to get some shots of the tool mounting next time I get to turning.

Cheers

I reground the tool so it had more clearance angle on side and top rake, and added a little radius. Cuts MUCH more nicely now, beautiful smooth finish to the eye, slight ripples to the touch.

What's weird though is I bought a 12x12mm index tool holder, not amazingly expensive, about 20 quid from arc eurotrade. Using the supplied carbide tool it immediately had the same problems as the home brew tool did before, even when adding some angle. Makes me think there is something else I am doing wrong.

Am going to experiment with locking the cross slide, as it does seem super sensitive, as well as getting the tool overhang as small as possible.

Cheers

yeah this is fun

Ross

haha cheers chaps, knew I could rely on you The most I have braved with my lathe is a 3mm depth of cut in mild steel at around 600rpm for a 40mm piece of stock. Didnt go blue which was a good sign!

And yep always have the safety specs on, I feel naked without them.

Hello

Is it normal for the chips to be hot enough to leave little burn pimples on your skin where they bounce off your arms / hands? The chips aren't blue, they are nice and silver. Is being prickled just part of the fun of turning?

Cheers

Ross

Thanks Hopper, I have emailed CES to see what they say. I couldnt see 4" bar on the site, biggest was about 3 and a half. I think I will need about 4.5 inches anyway for all the cock ups

Cheers

Ross

Hi, thanks all for the replies. I am really wondering what kind of stock to buy. For example if I wanted to make a 4 inch bevel, I am guessing I would need a piece of solid 4 inch diameter stock, but most of the suppliers online seem to top out at 2". Would you usually buy a specific gear blank, and who would you get such a thing from? Google finds me lots of people that want to sell or make me gears, but not blanks unfortunately : )

Also is unlikely I will use the chuck, I want to make it "just cos"

I would like to have a crack at making a 3 jaw chuck, and am looking at the scroll / bevel gear component. I know they are usually all one piece making it very complex to make, so I am starting simple and just trying to figure it out step by step.

If I wanted to make a bevel gear, what would be the stock material of choice, or are there dedicated gear blanks or castings you would need to buy? Ideally it would have the extra material on the reverse side for the scroll, and then I will probably need to find a CNC machine for the next step!

Cheers

Ross

Thank you for the comprehensive advice, and thats a great point about the vee blocks, The choice is bewildering Too much choice is a good problem to have though

I do like the look of that design, hopefully I can find an affordable one.

Thanks!

Hi John

Wow thanks so much for taking those shots for me! Do you need to make a special clamping arrangement or will bog standard vice strap clamps [I might be using an americanism there, if so please don't beat me with a rolled up union jack  ] do the job just as well? EDIT: Do you know if its possible to fit a swivel?

Edited By Ross Lloyd 1 on 25/06/2018 00:36:55