Another Haimer tip bites the dust or at least the mill bed

When I was at NYC CNC I saw that John was selling posters as shown below.

I didn’t realise the significance until I started doing CNC …..

I had been doing OK on breakages of late then like buses, two came along at once.  One was excusable (to my conscience) but the second was a disaster always likely to happen.

I had the Haimer held in a collet in the Myford VMB manual mill.  This means you need both hands occupied to contra rotate the collet and spindle when locking and unlocking.   I just overdid the realise pressure and the Haimer dropped out onto the mill bed.  Crunch, expletives, gloom, expense.  The tips are not cheap at GBP20+ each but Amazon do sell them.

There is the same issue to a lesser extent on the Tormach when releasing the power drawbar even though you are holding the Haimer the sudden momentum of the drop from the collet can sometimes catch you out if the mill table is close.

While discussing my gloom with a friend he suggested putting some sort of protection around the tip when loading and unloading from the spindle.   The Haimer is not an ideal shape for gripping something along these lines given its curved surfaces.  However after some thought a solution was found.   I drew a simple cylinder in Fusion that was 40mm long, 38mm OD and 32mm ID and 3D printed it.  Note these dimensions are for the Haimer FH 3D Taster version.

The cylinder sits over the probe and rests on the outer rim of the tip mounting.  The 32mm ID is just tight enough to squeeze the Haimer rubber gasket and so hold the tube in place.

Not only is this useful for mounting and dismounting the Haimer but it also works as a general protect guard when not in use.

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FlatCAM Update and experimental copper cutting

I’m quite pleased with progress converting GSpark PCB gerber files to CNC with FlatCAM.   The conversion process is straightforward and the resulting GCode looks OK.

I have tried cutting copper using the cutters I have to hand but quickly realised I need to get some much finer ones in carbide.  My tests with modified dental burrs does not work or at least not for very long before the burr goes blunt and the cut width degrades.

I have ordered some 10 degree included angle 0.1mm wide cutters but they won’t be here until February.

The picture shows two runs.   The left hand run used 30 degree cone shaped burr and the right hand run used a modified teardrop burr.   The initial cut on both was where the stars are.

The left hand cut left severe copper burrs which were easily removed using a scalpel blade flat to the surface of the board.

The right hand side was clean of all burrs but gradually degraded in quality as the cutter became blunt.

The teardrop burr was ground to half diameter in an attempt simulate a more normal engraving cutter profile.  I must have drawn the temper in the grinding process.

More experimentation needed once the better cutters arrive.

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Welding and being well and FlatCAM

Welding Course

Despite being laid low with flu since New Year I’ve attended two of the evening welding classes much to the contrary advice from my wife.  With hindsight she was right – I should not have gone the first night such was my state of health.

The focus so far has been on MIG welding and I am slowly getting the feel of things.  Too many variables to start with what with power, angle of attack, closeness to the job and of course wire feed rate.

How anyone did welding without the modern auto dimming helmets astonishes me.   They are amazing.

Not much else to report given the state of health but clearly I have now started to creep back into the workshop so health and state of mind must be improving.  Made a note in the diary to get a Flu Jab next year.

FlatCAM

Anyway more interesting stuff – my friend has asked if I can mill a prototype printed circuit board on the Tormach for him.   My initial thoughts were to bring the design into Fusion and do the CAM there.   However a conversation with a friend in Namibia lead me to FlatCAM which is a wonderful little program.   It takes the Gerber files from the PCB design package and converts them to GCode.   It is simple to use and produces nice code listings.   It gives you options to add your own GCode initialisation strings.    There are a few YouTube videos out there if you are interested.

More results to report when we have milled some copper.

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Heading home from France and Welding Course

Well we came out for the New Year to France with lots of jobs to do and both ended up totally incapacitated with flu.  Not felt so miserable in a long time and now totally weak and wobbly.

We did manage to get the new office sorted and it’s nice to sit here working in it.

We have decided to leave early and stay overnight near Tours on the run to the ferry.  The prospect of the normal 7 hour drive in one hit did not appeal to either of us.

You know what, if you are going to be ill, it is best done at your home with your own bed and I am really looking forward to unlocking the front door on Tuesday.

Wednesday night looms exciting however as my mate and I have registered on a 21 hour introduction to Welding Course over the next 7 weeks.  Got to get back on my feet ready for that.   Hopefully some new skills to be added to my very mature CV …

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The Power of Fing

While struggling to sort out the network folder issue with PathPilot v2 I mentioned that I could ‘see’ the Tormach and ping it.  One of the readers asked how I managed to find the IP address of the Tormach when it was automatically allocated by the server under DHCP ?

OK I am far from Cisco qualified so the next bit is how I see things work.  When a new device is added to the network for the first time you can either allocate a fixed IP address manually or let the server do that for you.  If you are a bit nerdy like me you might prefer to have a nice ordered manual list of all your main devices.   There is a slight danger that with fixed addressing you can drop the ball and allocate the same IP address to two different devices.   This is not good for the network and leads to smoke coming from ears.

DHCP takes the problem away.  Simply plug the new device into the network and it will talk to the server, get a IP address allocated and off you go.

The server keeps a register of which devices are active and generally will leave the IP address it has allocated unchanged between switch on uses.  It is a simple easy way to do things particularly for the non IT user.

To find if a device is live on your network you can send a ping command to the IP address of the device you are looking for.  The device will respond back and you know all is well.

BUT … if the device has been added using DHCP you will have no idea what the precise IP address of the device is.   So how can you ping something that you don’t know ?

There are lots of geeky commands to solve this problem but there is also a wonderful little App call FING.

FING can be loaded on desktops or portable devices.   When you run it up it sniffs the network and gives a listing of all the devices on the network with their associated IP address.   It also lists devices that have been seen on the network but not currently active.  You can tag names to each device and add icons for similar device types. Here is one of its screens

But that is just the start ….. it gives you the MAC address of each device.  MAC address is a unique number embedded in a network device by the manufacturer.   It is in essence a serial number.  The MAC addresses from a manufacturer will be similar looking so you can identify a device source.

On my wifi system I use MAC address filtering as extra security.  When a friend comes round and needs to log onto my network I can immediately see the device trying to get on but being blocked.  I can see the MAC address of his device and add it to my white list.

So back to the story.   I had loaded PathPilot version 2.0.0, enabled DHCP and connected to the network.  Fing immediately saw the Tormach and it was clearly communicating within the network.   This meant the problem was not network related but something in the Tormach not advertising the shared folder properly.

I thought that was going to be a short explanation post and look how long it ended up.   Short story – FING is a great app.

(BTW I have no connection, affilation, financial involvement etc with Fing.  I just like to tell people about what I regard as really useful apps).

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