Bridgeport Interact 4 Series 2 to Acorn6 build

[suntravel]

If you do not have a machine level, I would use a dial indicator in the spindle for aligning....

Uwe

[richardb15]

I have a 0.01degree digital machine level, I just didn't take a photo using it. To do the final setup I can use the KP1 probe too, lots of options.

[suntravel]

Not CNC related, but since you are into rebuilding old engines, I just made a flow testing thing for carb jets to reproduce parts for old carbs like Amal ect...

Uwe

[richardb15]

I see your rig, what is the white box, a flow meter, or flow & pressure? Myself and my wife make lots of carbs, jets etc for very early machines where it is not possible to obtain parts so we have to make them. If your setup there is a flow meter the varying fuel level, therefore pressure head, will make readings tricky. Actually the way carb jets were sized way back when was to run a set volume through them in a rig similar to yours and time it. I'm sure you know air temp is critical for consistency as fuel changes density quite a lot with temp. You can keep a consistent head by using a float chamber from a carb, or just time a set volume.

How are you making the jet holes? Only drilling them is not so good usually, oval, non parallel jet holes even by 0.01mm makes poor atomisation. We use very finely tapered jet reamers.

We don't own any motorbikes new enough to use Amal carbs, Amac or earlier for us! Our next project doesn't even have a carb as originally built, it just draws air off the top of the fuel tank and whatever vapour is in there, what could possibly go wrong.

[suntravel]

The white box is just a 60s timer for the magnetic valve, so I measure the flow for 60s 1m level and compare to original jets.

I have carbide drills in 0.05mm steps, if they do not hit the value, I figure out the right size with reamers also and regrind a drill for this size.

CNC drilling with carbide gives me less than 0.5% flow deviation in a series of 50 or more.

The reamers are old tools I used for racing with data recording and a lambda sensor to fine tune carbs, today with injection you can do this with a laptop

Uwe

[richardb15]

0.5% deviation is probably better than Amal ever made them! Nice job. Lambda sensor on our bikes is your backside and your ears:

In 2022 myself and my wife rode a 1915 and a 1913 JAP Vtwin powered motorcycles across Australia from Brisbane to Broome, took 4 weeks, but was a good test for the bikes, most of which we'd made, restored, built and prepared:

[suntravel]

Thanks for the videos of this adventure.

Uwe

[ShawnM]

Great video Richard, thanks for sharing. The bikes are very cool to see in action. I vacationed in Australia back in 2010 and it was the best vacation I've had to date. Brisbane was my favorite city as well.

[richardb15]

It's been a while with an update as I've been away working, but back in the shed now

My touch screen arrived, it is a PCAP type, 22" by FEC, who I've never heard of but thought it was worth a shot.





There are lots of mount holes on the back so plenty of options for me to sort out how to fix it. First job though was to do a quick temporary job on the old Bridgeport console arm so I can mess about with ergonomics before I build a proper housing to include the e-stop and on/off buttons too that are also temp mounted.





There was no setup, I just plugged it all in and it worked. In the pic the protective shipping plastic is over the screen so it looks a bit odd, that can stay on until I have it finish mounted. Anyway all good so far, nice and bright, clear images and the touch works very well, no need to press hard.

[richardb15]

I have a load of valve seats to cut too and have always shipped those jobs out, but having Centroid on the machine now means I can sort out and do my own. Standard Serdi/Sunnen valve seat tooling is hideously expensive but there is a crowd in China called Sanstone who basically sell interchangeable copies of the industry standard inserts and holders, so I figured I'd try those and see. I'm only doing cast iron so its not going to be as tough on tooling as machining hardened seats.



I need to make a BT40 mandrel to take the 2000 series insert holder as all standard valve seat tooling uses I think a BT30 or something. A job for when I'm over my jet lag!