Here is a list of all the postings Roy Birch has made in our forums. Click on a thread name to jump to the thread.
|Thread: Adcock & Shipley 1ES|
Has anyone fitted a dro to the Adcock & Shipley 1es and if so do you have any pictures of where the scales are fitted?
|Thread: Boxford VSL 500 Drive Pulley|
Yes you are correct, that is also one of the reasons I feel making a new hub from a block of cast iron.
No that’s not a crack it’s the piece that was broken off which I have just placed on the hub
One more thing to add is that I now believe this casting is at fault because the two pins in photo 5 should have sheared off befor the casting took any damage
So here is the pulley out of the machine, the drive gear shows some elongation of the holes for the drive pins so I think this lathe may have been put into back gear with the shaft still turning,
Photo 1 shows the area that is missing from the pulley, this distance is at least 2/3rds of the pulley missing some material.
Photo 2 shows why the lathe had a lot of slippage
Photo 3 seems to indicate that this is made in 2 parts as there is a golden ring around the part that holds the back gear which I assume is silver solder.
Photo 4 shows the deepest part of the damage with very little pulley side left.
Photo 5 shows the piece that I found against the drive belt in place on the pulley block.
This pulley block is different from the normal AUD as this one is solid and the AUD block is machined to have an internal hub which I assume has a lot to do with weight so any other replacement has to be the same as you would machine most all of the internal hub away. I now dont think the repair is feasible unless I drilled a new spindle lock hole in the undamaged area of the pulley and a new button oiler hole which runs into the small keyway in photo 5.
So upon further investigation I have found 2/3 of the missing piece, whoever was operating this Boxford at the time left this inside nicely against the drive belt, photo 1 shows the inside, photo 2 shows the outside which also shows that someone was trying to use the spindle lock with the chuck still turning and photo 3 is the reason for the belt slipping as this is the inside wall of the belt pulley, does anyone think this is user error or was the casting suspect in the first place? and does this piece and I am sure I will find the other bits iside the headstock somewhere make a repair more likely?
The main problem is that the VSL500 has a 1 3/8 bore which is nearly twice the size of the standard machines, it may of course be close on external diametre
The main problem is that the lathe is slipping due to the wall of the drive pulley being cast into the part that is missing so even if I tried to make a new one it would be difficult on this lathe.
I suspect the problem is that someone either pushed the spindle lock in whilst the machine was running or a chuck got stuck and they used too much force with the spindle lock engaged, I dont have the facility to make a new one as I would want the main headstock pully out of the machine to make test fits and I dont have another lathe I could use.
The photos are in the wrong order, they start at the bottom
The delamination of the cast iron is at max 3mm deep where the drive pin is, the delamination travels 1/3 of the circumferance of the pulley and is exactly from jaw 1 to jaw 2 on the Chuck
I will get a picture, the problem is that the chunk of cast iron that is missing also forms the inside wall of the pulley.
|Thread: Boxford VSL|
I have a Boxford VSL that I am looking to install this weekend but on another forum the subject of bed twist came up, I was planning to set this lathe up on machinery levelling pads the same way as my Myford Tri-Leva is set up, the forum suggests that this lathe should be bolted down, in my experience it is sometimes the bolting down that causes the twist. Does anyone have any suggestions as to what is correct?
|Thread: LBSC 440 Virginia|
I am going to try spring steel from a commercial provider, the only problem is 5 leaves from 20 gage spring steel will not quite fit the hole in which they are housed, I did see a picture of Polly in 3 1/2g with working springs and that one used leaves that were doubled up into pairs so each spring has 10 leaves in 5 matching pairs, perhaps the drawings are open to quite a bit of interpretation as they only show 5 single leaves per spring. I have tried to contact a gramophone restorer to see if they can tell me the gauge of steel on gramophone governors.
A quick search brings up an article from popular science from some years ago that indicates the gauge of steel as being 20g.
I have learnt that there are errors in whatever you build and nothing is perfect in the Model steam loco builds, I am just going to plough on with help from the forum and post pictures of progress at each stage so that someone can spot an error before I move on and lets be honest by the questions I am asking there is bound to be errors, as long as these are not in expensive components I will be happy.
I am going to change to working springs and dispense with the castings, does anyone know where I can get the steel to make the working springs?
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