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21
Metal Stuff / Flat Irons
« Last post by NormanV on April 23, 2018, 11:13:33 AM »
A couple of weeks ago, at a car boot sale, I bought 3 flat irons as a potential source of cast iron. The first thing that I did with them was to put them in my furnace and heat them up to red heat and then allow them to cool overnight just in case that they had been chilled when originally cast.
Today I wanted to make a chuck backplate for a small lathe that I am making. I trimmed the first one down to a squarish shape with my trusty angle grinder and popped it into the four jaw chuck on my lathe. After facing it off I was surprised to see that it had four large cracks (only 3 to be seen in the photo) making it useless for this project, although there is enough uncracked material for future smaller projects.
I tried again with the next one and was delighted to find that it had no cracks. Mind you it is tough material, I could only take 5 thou deep cuts otherwise the belt would slip on my flat belt drive lathe. When you consider that I was using an irregular shaped piece of iron there was a lot to remove before I got to a round shape, but it was worth it!
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Electronics & IC Programing / Re: Which lathe (err... Scope) Rigol
« Last post by PekkaNF on April 23, 2018, 08:49:05 AM »
I was actually thinking of that SDS1202X-E Siglent, it appears to be a lot of scope for the money...unfortunately I heard (and read to find out if rumors are true) that SW is substantially more flaky that Rigol.

So I will not go below Rigol and very tempted to buy one of most popular scopes, but I'm considering spending more money for a brand name scope it performs better.

I tried to google if the Rigol DS2102E 50 ohm input is proper analog circuit and not just switched attenuator and could not find definite answer. After all: I was willing to sacrifice 2 extra channels for 50 ohm input, bit more BW and pay some more.

I tried to check Keysight DSOX1102A + 100MHZ UPGRADE. It's even more money and missing the 50 ohm input. Ends up being very close to 1000 with taxes and therefore it's pretty much out of the "race".

Pekka
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by WeldingRod on April 23, 2018, 07:44:52 AM »
I suspect its connected with probing!

When Z+ stops working, if I do a probe Z+ it starts to probe DOWN at a stupidly slow rate! Its as if it thinks it has found the limit switch at Z+ and is now very very slowly coming off the micro-switch in the Z- direction ( as it should do fairly quickly) to the probe offset position (5mm in my case)

HTH Will

BTW the DoseDone forum has gone a bit quiet recently!!:

http://www.ddcnc.com/forum.php?mod=forumdisplay&fid=41
I have noticed an axis stopping semi-mysteriously, but it's always been a triggered limit switch.

Sent from my SAMSUNG-SM-G891A using Tapatalk

24
New from Old / Re: Resurrecting a Portakabin
« Last post by wgw on April 23, 2018, 06:56:10 AM »
Portacabins don't last well, I would put a few posts up with the round sheets as a roof, just to keep the rain off the cabins. To late now ,but a good source of rounded sheets for pig arcs etc. is old grain silos.  We have two cabins, flat roofs. These were made for accommodation units on a oil platform yard and are well made. Roof started seeping last year ( only about40 yrs. old ) .By far the cheapest remedy was roof over in steel sheet on 4x2 timbers.
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New from Old / Re: Resurrecting a Portakabin
« Last post by awemawson on April 23, 2018, 05:40:50 AM »
Hanging around this morning waiting for a delivery of cladding for the chicken shed so I thought I'd have a go at exposing the two Jacklegs that or obstructed by overgrown fencing.

Jackleg C was behind an amazing growth of Ivy - one root of which resisted until I gave up trying manually and tucked the bucket of the JBC803 behind it to show who was boss. Even so it resisted for a while !

Jackleg D was far easier - relatively little ivy.

Then is was just a case of removing the feather edge fencing sufficiently to allow me to get at the jacking points. Fortunately I saved some identical fencing from a length I removed years ago - all stacked alternately thick / thin edge and tightly banded to prevent warping - they seem to have survived the ravages of time  :thumbup:

Between the two Portakabins is a roof forming an open fronted store used for the ride on Mower - the roof in 'Onduline a bitumen felt corrugated and slightly flexible material. As this Portakabin is jacked up the  Onduline is going to have to absorb the movement, although the two sheets nearest the gable end will have to be removed to give access. One sheet has sagged and needs replacing anyway as vegetation has built up on it and water has puddled over the years.

 . . .OK done all that and the cladding is still not here  :scratch:

 
26
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Will_D on April 23, 2018, 05:27:44 AM »
I suspect its connected with probing!

When Z+ stops working, if I do a probe Z+ it starts to probe DOWN at a stupidly slow rate! Its as if it thinks it has found the limit switch at Z+ and is now very very slowly coming off the micro-switch in the Z- direction ( as it should do fairly quickly) to the probe offset position (5mm in my case)

HTH Will

BTW the DoseDone forum has gone a bit quiet recently!!:

http://www.ddcnc.com/forum.php?mod=forumdisplay&fid=41
27
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Will_D on April 23, 2018, 05:23:03 AM »


I am starting to suffer this but only on the z axis. It will jog down but not up. Power off and wait resets it.

I am running the [Install_2018-01-21_91] new 2.1 version.

I may well go back to the stable 2017 version for 1.1

When it freezes, do your other axis still work?
Yes X and Y are unaffected
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by ryan8 on April 22, 2018, 07:33:21 PM »

So you're saying it started doing this when you were still using the OEM firmware?

Yes; I was hoping it was a firmware issue that would go away if I updated.

Optoisolaters give galvanic isolation and some degree of filtering, ( depending on their speed ), but they will pass a transient through if it has similar properties to a bona fide signal

Ah, that makes sense. A guy on the tech support forums suggests that it could be phantom limit switches being triggered. Though I don't have limits enabled, it does fit with the "other axis will still work" weirdness.


I am starting to suffer this but only on the z axis. It will jog down but not up. Power off and wait resets it.

I am running the [Install_2018-01-21_91] new 2.1 version.

I may well go back to the stable 2017 version for 1.1

When it freezes, do your other axis still work?
29
CNC / Re: Electricuting the lead screw
« Last post by PK on April 22, 2018, 06:28:34 PM »
That's just a normal three phase motor, or a single phase, or a large hamster in a running wheel.

One pulse per rev is all you need to cnc turn threads.

I have a party trick (which I can't find video of). 2 start tapered ACME thread. All done with......wait for it......one pulse per rev.

30
How to's / Re: Homemade layout fluid
« Last post by krv3000 on April 22, 2018, 02:49:29 PM »
brill
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