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Member postings for Pete Rimmer

Here is a list of all the postings Pete Rimmer has made in our forums. Click on a thread name to jump to the thread.

Thread: ACME thread identification question.
14/09/2019 20:32:26

ACME is standardised in imperial units but the form can be used for metric leads. If you were cutting the thread to a metric lead you'd have to convert the lead to inch pitch then grind the tool nose width appropriately. However, if you were rolling that metric thread you'd have to have a non-standard set of rolls manufactured.

Since the vast majority of the early Boxfords were inch screws I wonder if they had the metric threads cut but the inch ones rolled for cost purposes?

14/09/2019 12:48:10

Here's the drawing, as found in the files section of the Boxford Yahoo group.

14/09/2019 10:06:20

I think it's fair to postulate that the thread rolling was farmed out simply because the drawing only specifies the blank diameter for rolling, not the specific tolerances for the rolled thread which you would expect would be on the drawing if the rolling were done in house. The integral gear on the other hand has those specifics listed on the drawing.

I'll see if I can dig it out and post it.

The South Bend lathe that the Boxford was copied from had cut threads which we know because Larry Vanice has the leadscrew cutting machine they used at the factory.

Thread: PayPal Warning
13/09/2019 12:46:57
Posted by speelwerk on 13/09/2019 10:32:24:

On the Dutch PayPal site under the heading "Payments" (Betalingen) you can stop authorising Ebay to automatically debit your account. Niko.

I just checked and I have this option too.

For anyone wanting to check it out, log in to Paypal, click the little gearwheel icon top right to go into settings, click Payments, look under eBay refunds and disputes. You can turn it on or off as you prefer.

Thread: ACME thread identification question.
13/09/2019 11:16:48

The Boxford drawing specifies that the threads are plunge rolled - for the imperial leadscrews at least.

Full marks to Tracy tools for an excellent customer service. Many would be happy to just sell an unwitting customer anything they asked for even if it was clear that it was probably not what they required. Clearly, Tracy tools places more value on their customer's satisfaction than your average supplier. Good show!

Edited By Pete Rimmer on 13/09/2019 11:21:19

Thread: Vickers Bl 8 inch Howitzer cannon of 1917
08/09/2019 02:11:20

Nice work Mal - a true labour of love.

BTW those breech threads look very similar to a smashed-up 6" gun I saw that was part of Germany's defence system on Jersey in WW2. The threads themselves look very straightforward to cut, apparently just a 90-degree vee form (interrupted, obviously). What is not so simple is the shape of the cutouts, which are shaped to allow the breech plug to swing in.

I added an album with the relevant pics, which are woefully lacking in detail but it's all I have from my visit in 2011. Also of interest is the bunker below the gun has been preserved and contains many rescued artefacts from the war, including a stack of 6" shells. As far as I know this is all still there to see. the bunker is (or was back then) opened up for free tours one Sunday each month in the summer. I was very lucky to have bumped into the tour guide in my hotel.

Keep up the great work on the model!


Thread: Dumb question from a none driver
05/09/2019 13:19:02
Posted by FMES on 05/09/2019 11:40:47:


'Patently Absurd'?? Whos name needs to be on the V5 on taking up posession of the vehicle?, who will get the notification to tax.

I was advised from Swansea, some years ago admittedly, that the 'owner' was the person purchasing the vehicle as new (as declared at first registration on the V5) and paying the relevent purchase taxes / VAT etc, secondary transactions between private individuals are not recorded in the same way hence the description of 'Registered Keeper'.


That's just DVLA's method of explaining the difference between owner and keeper for THEIR PURPOSES so that even the slowest-witted person could 'get it'. There's nothing magical about vehicles that makes the ownership of them different to the ownership of any other material thing.

05/09/2019 09:28:14
Posted by Steambuff on 02/09/2019 12:54:47:

Since you registered the car in your name you are the Keeper ....

But, since you gave your wife the car as a present .... She is now the owner!


Only until the tyres need air, the engine needs oil or the wiper blades need changing Dave :D

Thread: help with gear calculations
03/09/2019 00:30:31

I don't think Howard is suggesting that, he's saying that given the obvious wear in the handwheel pinion and the reported noisy headstock gears he's hoping for your sake that the screwcutting gearbox at least is in good condition so that you may have the full range of feeds and cutting pitches.

Thread: ACME thread identification question.
02/09/2019 14:00:47

Well yes I realise that it would take nothing more than a small adjustment in half depth or tip width and it IS very small but still there must be a drawing that says more than 7/16" ACME 2.5mm pitch LH. They specified the OD for the blank for rolling the thread on the imperial cross slide screw to 4 decimals.

02/09/2019 13:25:12

For a thread like that there must have been a factory drawing showing the departure from spec for thread cutting depth on both the nut and the screw although the screws were rolled which begs the question how did they roll an ACME thread at a non-standard pitch or why would they even do that when you could roll a trapezoidal thread on the non-standard diameter without having to have non-standard rolls made.

Somebody somewhere must have that drawing.

Thread: Dumb question from a none driver
02/09/2019 01:16:06
Posted by Paul Kemp on 01/09/2019 22:45:57:

Apparently this is a legal principle of insurance that you can't insure something against loss unless you are the legal owner and it is you that will suffer from a loss.


My wife's car that I bought new is registered in my name but my wife is the only driver and she has a fully comp policy on it. It was done like this because I bought it for her as a birthday surprise. The insurer knows this and is perfectly happy with it. I am the owner, she is the insured.

Thread: Binding leadscrew.
31/08/2019 15:03:35

I think that it's much more likely that one of the hangers are twisted. There's loads of ways you can check this but if tooling is minimal here's one way that needs just a good ruler.

Block up one end of the screw so you can remove the hanger without it drooping. Now measure from the screw to the machined face on the bed casting (allowing for any sloppy play at the other end) and compare that distance both ends. It should be the same. Do the same both ends until you find out which end holds the screw off-parallel to the bed. Now swap the hangers. If the problem swaps ends it's the hanger that's at fault. If not then it's the main bed casting.

Thread: Dumb question from a none driver
31/08/2019 13:53:23
Posted by Nicholas Farr on 31/08/2019 13:15:36:

Hi Pete, However, when the transfer is registered any tax against that reference number will become null and void.

Regards Nick.

Yep, and to put icing on the cake, the registered keeper gets the refund, not the person who paid.

My guess is the transfer was done online, the V5C will turn up in a few days and the son will be the properly registered keeper and the vehicle properly taxed. Most likely option since the alternative would require someone to relinquish the vehicle whilst retaining liability for any fines it might accrue.

31/08/2019 13:07:26
Posted by Dave Halford on 31/08/2019 12:12:17:

How was tax sorted out when it seems to be not registered correctly?

DVLA don't care where the money comes from, all they want is the reference number off the V5C (which the new keeper should not even have) and a payment from somewhere, and that the vehicle be insured. Doesn't have to be the owner or keeper that pays.

31/08/2019 12:07:36

I would not worry about the ownership issue, for a start you have evidence that you paid £700 for it so that's the perceived value from both your and the seller's perspective. That would satisfy the CAB. Secondly your messages showing that you bought the car, not your son. That makes you the owner and he (eventually) the registered keeper. This is actually a sensible way to do it since he'll be the user and responsible for it's usage plus any potential fines for driving, taxing or C&U offences etc but you remain the owner of the property.

The easiest way to transfer a vehicle is for the seller to do it online. It happens immediately and you go away with the new keeper slip so you can then tax the vehicle. It's possible the seller did this but they shouldn't have given you the V5c if he did it, just the new keeper bit.

If he didn't do it online then best idea is get a signature from the seller ASAP and send it off yourself so you know it's done. Keep hold of the new keeper slip so it can be taxed.

Thread: Lathe steady position
31/08/2019 09:49:21

When you're lining it up use a smallish piece of stock in the chuck to do it. Alignment is more critical as the diameter of the part decreases.

Thread: ACME thread identification question.
30/08/2019 11:58:26

Edited By Pete Rimmer on 30/08/2019 11:58:47

Thread: Lathe steady position
30/08/2019 10:56:49

Looks like the wrong steady or a badly drilled apron.

I would mill an inch wide flat across the holes to the depth of the counter-bore. Slot the holes to let the steady slide forwards into alignment and make a clamp plate to span the slots.

Before doing that, or lacking milling facilities, I would clamp it up with the front bolt only and see if it will rotate into a suitable position. If it does, re-drill the back hole further inboard.

Thread: ACME thread identification question.
30/08/2019 10:01:23

The Reltub guy who sells them on eBay quotes the size as 7/16" x 2.5mm ACME which is a bit unfortunate but not surprising IF he's correct about the ACME thread form. As I said above Denford used ACME for the imperial screws and modified square for the metric.

I'd be tempted to use the imperial one and suffer the 0.04mm-per-turn error for now until a metric replacement pops up. It's no worse than having the tool off centre height on a small diameter and much less than a badly worn screw.

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