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Member postings for Chris Trice

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

Thread: Pultra P type 8mm nose thread
20/01/2019 12:06:02

Offering up an M6 machine screw to the spindle nose (or a thread gauge) would be an easy way to confirm the pitch.

Thread: Crumbling Monkey Metal
20/01/2019 11:58:54

What Tim says. A lot of old die cast cars from some specific manufacturers have the same problem usually around rivets.

Thread: ER32 Collet Chuck
20/01/2019 11:26:06

Assuming you can get the accessory to fit its intended victim, I'd be inclined to carefully and minimally remachine the taper and screw thread so everything was all concentric. You shouldn't have to but since you're already down that road... Cocentricity is more important than any additional slackness in the closing thread providing you don't make it so slack the threads are likely to fail completely and assuming the closing nut is manufactured accurately.


Thread: Mill Spindle Readout
20/01/2019 10:55:11

These are almost certainly used to scroll through the parameter, pro-

gram, and special function menus to get to specific settings or functions.

Thread: ER32 Collet Chuck
20/01/2019 01:29:11

The chuck does look like a Soba.

19/01/2019 20:42:37

Let's not be too down on the Chinese. If it's a Soba one or from the same factory, it's Indian. The one I bought (what was I thinking?) would not fit the lathe register. It was a good ten thou undersize. I couldn't be bothered. It went straight in the bin.

Thread: Is it just me?
19/01/2019 10:20:12

This is another case where the technology that seems like a good idea has a badly negative effect because for whatever reason, it fails to deliver what it seeks to provide.

Thread: London Model Engineering Exhibition - Alexandra Palace
19/01/2019 10:11:44

Don't mistake my comments for not enjoying it as I managed to restock with virtually everything I wanted to. I think HT's photos were taken during a quieter moment because it was populated more than this. It might also be the case that the weekend will yield a larger footfall. It just struck me as a little more spaced out than usual.

19/01/2019 00:05:49

I went today too. I generally agree that it felt a little thin. Quite a few dealers I expected to be there were absent. I probably spent the least I've ever spent at any show. I also left earlier than any previous year. Made up for it by dropping in to Hannant's near the RAF Museum in Hendon on the way home to top up my "fix" for the day.

Thread: Best value parting tool for mild steel?
17/01/2019 10:24:49

Parting is generally done at about 50% of the usual cutting speed. You might find use of a rear tool post advantageous.

17/01/2019 10:23:28

You might find this useful: https://en.wikipedia.org/wiki/Speeds_and_feeds

17/01/2019 10:01:09

500mm???? How big is your lathe. I assume you mean 50mm? There are cutting speed tables online that are worth referring to.

Thread: Ball bearing spindles
14/01/2019 19:47:13
Posted by Neil Wyatt on 14/01/2019 19:02:40:

According to the article I linked, bearing quality is NOT related to bearing spacing. You can have a high quality slack bearing.

"There is often confusion with “looseness” and precision level. Radial play is specified independently of ABEC tolerance classes for rings."

So perhaps we are worrying about the wrong things.

But an angular contact bearing will still be better than a deep groove bearing for taking end thrust.

Neil

Thinking about it, there would have to be a radial clearance for angular bearings to work otherwise they'd just be the same as deep groove bearings but with one side built higher than the other.

14/01/2019 19:43:07

The way I understand ball bearings are made, they're made in batches, so if they are inaccurate in their nominal size, all the ball bearings in that batch are uniformly inaccurate and therefore the tripod scenario you suggest is not likely to be an issue within measurable tolerances. If you mixed ball bearings from different batches then there might be a tripodding (good word) issue. It's why you shouldn't be seduced into mixing new bearing parts into old bearing parts when feeling lazy repairing something.

Edited By Chris Trice on 14/01/2019 19:44:02

14/01/2019 17:21:23

Neil beat me to it.

14/01/2019 17:20:54

I think Neil is suggesting that the tighter the balls are in the race, the nearer the contact line is perpendicular to the axis and any preload acts like a wedge driving the balls outwards (and inwards) rather than holding the things axially.

 

Edited By Chris Trice on 14/01/2019 17:23:38

Thread: Small Milling/Drilling Spindle (again)
13/01/2019 12:42:25

I have the book and agree with KB. I built the spindle in chapter 5 but arranged for the outer race of the rear bearing to sit firmly in the body rather than float so preload could be applied.

Thread: Endfloat Myford Super 7 and thrust bearing condition
13/01/2019 03:44:15

Don't forget to lubricate the bearings with oil (not grease). I've now done the taper roller conversion on mine but the principle remains the same. I tend to adjust mine to fairly close tolerances but the acid test is that if you exert a firm force on the spindle from the tailstock, if things tighten up (the bronze bearing) then the two roller bearings at the rear of the spindle want to be adjusted forward just a gnats to stop the tightening up happening. This assumes you've already set the preload correctly with the lockable collar. It's important to lubricate the front bronze bearing with oil daily and I do it not only with the wick system but actually touch a drop of oil to the front and rear edge of the bearing and let the rotation of the spindle carry it around itself.

Thread: Telephone / Internet Scams
11/01/2019 19:14:15
Posted by SillyOldDuffer on 11/01/2019 17:14:39:
Posted by KWIL on 11/01/2019 15:12:10:

What am I doing correctly?, I rarely get scam emails or phone calls as described in this thread!!

Luck perhaps? Despite keeping a low profile and having a hardened system I get dodgy emails - they started after a friend forwarded one of those 'joke' emails to me and a bunch of other mates. By sending the email all our addresses were blind copied to the original sender, who sold them on. Please don't copy funny ha ha email junk to your friends!

A colleague who ran his own mail server was able to use a slightly different address each time he shared on the internet. By monitoring which aliases got spammed he was able to identify which businesses were selling his details on. (Later this became illegal) In addition, many legitimate companies have lost customer details to hackers, as in this example. Don't use free wifi access to conduct sensitive business without a VPN - wifi hot points are easily monitored. Don't use unencrypted wifi at home either.

There isn't a policeman patrolling the internet unless you're buying guns, drugs or porn. In the UK the Information Commissioner chooses not to act proactively - they intervene AFTER your data has been lost, and are unsupportive if you ask for confirmation that an organisation actually has appropriate security in place. As good security is expensive it's common for IT systems to be inadequately protected at any of several key points - risk assessment, policy, design, build, maintenance, networking, processes, management, ethics, or staff management. Hackers are rather expert in exploiting IT weaknesses caused by corner cutting.

Safe enough with reasonable precautions but the price of peace is eternal vigilance.

Dave

Since the change in the law where websites now have to ask you to accept their cookies, it's interesting when exploring the cookie settings of such websites how much information they want and to who they're passing it on to. Pretty much every website does it which means a buck is being made along the way. Those that allow me to deny all such requests get my patronage. Those that do not, get no traffic from me. Some do allow you to deny all cookie requests but will still let you read the website (BBC News for example) but the most annoying are those that instantly throw up an "Accept Cookies" window that obscures what you've come to look at with no option to decline. I hit the back button straight away. I've also set up a couple of bogus name email addresses I give to those I suspect will spam me (a) to avoid having to see it and (b) to identify which organisations have passed my information on to the spammers. Last night was an example. Toby Carvery are currently offering a 40% discount if you give them your details. Using my mobile, I found their webpage, gave them the bogus email address, they showed me the discount code on the same application page which I passed on to the waitress and then I deleted the page without completing. Consumers 1, Spammers 0.

Thread: Myford felt wiper
11/01/2019 16:55:50

Home And Workshop Machinery have genuine Nottingham felt wipers available bought from Myford when they closed.

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