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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: Availability of a T33 & T34 Myford Change Gears?
05/06/2021 22:49:12

I did a batch of 33 and 34T for the myford about a year ago when they were unavailable. I have some still sitting on the shelf if you can't find them elsewhere.

Thread: Taper due to tailstock height misalignment.
05/06/2021 12:36:41

There for sure will be measurable differences between clamped and un-clamped. Only the quality of fit / extent of wear will dictate the degree of difference. My old Monarch has a bit of wear in the tailstock and I can adjust the taper with the tailstock clamp, it's one of the jobs I have to tackle in the near future.

Thread: Ebay Chancers
05/06/2021 09:48:55
Posted by Robert Atkinson 2 on 04/03/2020 21:01:23:

Just to be clear, I didn't mark the item (a Schaffner System 2050 EMC Impuse generator) up to £1500, I listed it as an auction starting at £50. The market set the price and the buyer (a business) was very happy at £1500 for a ystem that cost over £50,000 new. They even paid for my time, fuel and hotel to personally drive it to Scotland.
I don't make money on everything, but overall my hobby is self financing.

I did get scammed as a buyer many years ago (pre PayPal) over a £500 Tektronix portable 'scope. Buyer looked genuine, had a website etc. I won the auction an sent off a check. Check cleared but no 'scope. further enquires found the address was a "corner shop" informal po box. It was a deliberae scam, specifically targeting test equipment. The police were involved but the supposed fraudster had "spent" the money and had no assets. They added to their criminal record and got a minimal penalty. No one got any money back.
People complain about PayPal fees, but they provide a safe transfer service for buyer and seller.

Robert G8RPI.

Robert if you collect/repair those Tektronix scopes I have a water damaged one I paid a tenner for. It's way beyond repair but has all it's leads and probably a good source of parts.If I got my tenner back I'd be happy.

Thread: Sine bar
05/06/2021 08:56:52

You are very right Alan a 125mm sine bar will give you a different result to a 5". Not innacurate, just different. You could not use 5" sine bar tables but find 125mm tables or do a bit of trig.

Thread: What are these morse taper collets for?
01/06/2021 17:20:11

I have a couple of those in MT1 size. They are for holding drills.

Thread: Myford extension for spindle.
31/05/2021 19:03:34

I'd like to know how concentric the bore and OD are.

Thread: Strange mini "turret" lathe?
31/05/2021 12:38:33
Posted by Andy Carlson on 31/05/2021 09:20:24:

Me neither. I did have a punt on this one a week ago but was outbid...

https://www.ebay.co.uk/itm/184838331000

Did anyone else have a look at that one? Some sort of small gear hobbing machine as far as I can see but doesn't look like the Jacobs to me.

Not sure I needed it, but I think everyone likes a hobbing machine... in the same way that everyone likes a shaper.

I don't have a shaper but I love my hobbing machine and I use it often.

Thread: New Boxford owner
28/05/2021 23:34:17

Stick with it Paul, you'll have a lot of fun finding out what works and what doesn't.

Thread: Screwcutting on the Bantam
28/05/2021 20:11:43
Posted by Andrew Johnston on 28/05/2021 19:02:01:
Posted by Pete Rimmer on 28/05/2021 17:11:01:

.......85DP that's the exact pitch for 27TPI

Close, but it's mathematically impossible for it to be exact.

Andrew

Error of 77 millionths of an inch is exact enough to satisfy common tolerances. Not mathematically exact as you say since you have to divide the Pi by DP to achieve a recurring decimal.

 

Edited By Pete Rimmer on 28/05/2021 20:17:40

28/05/2021 17:11:01

Where abouts ar you William? My lathe does 27tpi on the gearbox you're welcome to use it if you can get to North Kent.

Otherwise I could hob a change gear for you.

Incidentally if you have a chart for DP threads see if theres a way you can add a multiplier to achieve 85DP that's the exact pitch for 27TPI

Pete.

Thread: Holbrook Lathe Question
26/05/2021 17:35:02

Whoops - I guess like most I just assumed Kevin was in the UK.

Value suggestions might not be relevant for your locality Kevin, but I do wish you good luck with the disposal and hope that you'r not finding it too difficult sorting through your dad's stuff.

Pete.

Thread: Strange effect when turning
24/05/2021 20:25:46

Depending on the model of Craftsman it could be the headstock misaligned on the bed, or the bed is twisted somewhat.

Thread: Holbrook Lathe Question
24/05/2021 19:20:19

Excellent!

I also have a 10EE, I didn't know of anyone else in the UK that owned one until just now.

24/05/2021 18:31:21
Posted by Kevin Hart on 24/05/2021 01:27:48:

My father built model steam engines. He has passed away an I’m assisting my mother in selling his machinery. He has a Holbrook either C8 or B8, as I can’t tell the difference in pictures online I’ve found. I’m unable to upload pictures here. It’s in very good condition as confirmed by two other machinists. How do I go about attaching a value to it? I’m willing to email photos.

That's a gorgeous looking example Kevin. Worth more than any of the values quoted so far in this thread due to it's condition and the multitude accessories that can be seen. Your dad must have had great pride in his workshop.

Pay attention to the smaller items that he owned, going by what's visible in the picture it's likely that there are some valuable tools in there which you might pass over as insignificant.

Thread: Cycloidal gear hobs
24/05/2021 17:29:24

That would make sense John because the shape wuld change on smaller tooth counts.

As I said I have no clue about cutting these types of gear. I do recall being most upset when I found out that my 33DP gear cutter (a very rare involute size) turned out a lovely cycloidal gear

I have catalogued the first twenty cutters and they are a mic of DP, CP and module. Some are actually marked as module but an insensible size (like 0.505 mod) until you realise that it's exactly 1/16"CP. Seems to be no rhyme nor reason and I guess conventions have changed over the years my collections span.

I will continue to catalogue them and see what I end up with. I have about 20-25 ratchet/escapement hobs to measure also. Some are new in the box.

Thread: Todays Car Boot Bargain!
23/05/2021 14:20:49
Posted by Rob McSweeney on 23/05/2021 13:53:36:
Posted by duncan webster on 23/05/2021 13:26:04:

I think you'll get more joy searching for Pittler lathes, looks like a re-badge job to me.

http://www.lathes.co.uk/pittler/page5.htlm

The Pittler lathe on that page is the exact one the OP has just bought. Got the same marks and scratches.

Thread: Cycloidal gear hobs
23/05/2021 14:16:46

I'm (slowly) working through them. I have cycloidal hobs that conform to sensible numbers in DP, module and metric circular pitch so far. For instance the latest one I've measured only makes sense for it to be called a 2.25mm circular pitch. The module would be 0.7163.

I've knocked up a spreadsheet so I can input the normal pitch and it spits out all the conversion numbers. I was using the chart from Davall which is very good but I have loads that just don't appear on it.

Using the microscope shows me that I have not so many cycloidals as I thought, some are all kinds of weird shapes. For instance I have one which is triangular shaped, straight sides 55deg rounded root and crest just like a Whitworth thread (except a straight sided hob will produce involute teeth) and a pitch of 0.0394" or 1mm CP. Somebody somewhere must be chuckling at me.

I would dearly love to get some insight from someone who has hobbed cycloidal gears in the past. Some of my cutters have tooth counts on them too.

Thread: New use for a slide rule
23/05/2021 13:43:01

I have a slide rule but I have no idea how to use it. Then again, I'm only in my early fifties

Thread: Bench (tool) grinder
23/05/2021 12:21:53
Posted by Michael Gilligan on 22/05/2021 20:30:40:
Posted by John Haine on 22/05/2021 20:18:03:

... I've never seen a resin bonded CBN wheel! ...

.

Out of my price-range, I suspect ... but here goes: **LINK**

https://www.superabrasivetools.com/resin-bond-cbn-grinding-wheel/

MichaelG.

There are budget ones Michael, I bought a 8" one for under £50 to use for grinding abrasive stones flat. I also bought a couple of 5" tapered edge ones for my tool & cutter grinder for sharpening hobs. They were just over a tenner each.

amazon link

Edited By Pete Rimmer on 23/05/2021 12:24:53

Thread: Strange result from the forum search ...
23/05/2021 10:45:25
Posted by Michael Gilligan on 23/05/2021 10:05:43:
Posted by Pete Rimmer on 23/05/2021 10:01:13:

Does the forum search return result pages in order of date ascending or descending? It's an option in your profile.

.

Sorry, Pete ... I don’t understand the relevance of that.

My problem is that the search gave me one result and that result is wrong.

MichaelG.

I don't know if it's relevant at all just wondering. After looking at it again I don't think it is. I wondered if the default view for the "thread start page" option in account preferences would affect the order that the search engine 'sees' the page numbers, thinking that perhaps changing the option might reverse them.

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