Here is a list of all the postings Ian P has made in our forums. Click on a thread name to jump to the thread.
Thread: DRO fitting |
16/08/2022 21:07:57 |
Posted by old mart on 16/08/2022 20:52:13:
With a smaller mill, you may loose some Y axis travel if the X axis encoder is at the rear of the bed. At the front, it might interfere with the X axis stops. The 'may' and 'might' can be eliminated with a thoughtful installation (or at least the travel loss can be minimised). The link in Jason's reply shows an installation which does not lose any Y travel because it mounts the scale on the front of the table, however I would find that setup unsatisfactory because it has eliminated the use of the front edge of the table as a reference face and it also prevents machining work that overhangs the table edge. (I made brackets so that I could mount my Y scale below the table surface. Ian P |
Thread: Cutting a slot in a screwhead |
29/07/2022 20:41:17 |
I find its a very trial and error process. I sometimes true up arbor faces and spigot diameters in the lathe and without removing the arbor from the lathe, fit the blade and still get runout at the saw teeth. I could probably reduce the blade wobble by having a large diameter arbor that only leaves enough of the saw teeth exposed for the depth I intend to cut. I find that with, say a 1mm wide x 75mm dia sawblade with a 38 diameter arbour if there is any wobble the slot position partly depends on which part of the blade circumference make first contact and makes a channel for the rest of the blade teeth to follow. Ian P
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Thread: Another great delivery |
24/07/2022 11:18:27 |
Posted by David George 1 on 24/07/2022 09:09:51:
I ordered a M2 dead center as the M1 dead center and M1 - M2 sleeve was to long for bed of mill. It was ordered about 11.00 pm Thursday night. It arrived by post 9.30 Saturday morning. Arc Euro Trading delivers again. David Most companies send out same day if they receive the order before a certain cut-off time, after that its all down to the delivery method. Large companies like RS and Farnell accept orders up to about 7pm and deliver next day. I regularly used to order from a company in Warsaw who took orders up to 2pm, charged a fixed £7 for next day courier delivery and I was only let down once out of twenty or so orders due to a flight/airport delay. Unfortunately they no longer deal with private UK customers and for some reason they do not sell some of their products (even to account holders) in the UK. (Of course this has nothing whatever to do with Brexit!) Ian P |
Thread: New motor for wabeco lathe |
13/07/2022 22:43:04 |
Posted by SillyOldDuffer on 13/07/2022 19:33:53:
Posted by Robert Atkinson 2 on 13/07/2022 19:26:40:
A motor with brushes, a commutator (segmented rotor contacts) and a wound stator (not permanent magnet) will run on AC or DC. For this reason they are often called a "universal" motor... Doh, is it that simple? In my defence, the spec says it's a 1.4kW motor, which I assumed is too big to be a Universal. Don't know why though, except I've only come across Universals on sewing machines and small power tools up to about 250W max. Dave
Universal motors appear on angle grinders, vacuum cleaners, SDS drills and jack hammer things, I'm sure I have seen some rated well over 1kW. Ian P |
Thread: Metric or UNC Threads in Aluminium |
06/07/2022 14:42:41 |
Whatever fixings are used to hold this disk to its hub, holding it to the hub is their only function. I cannot see how there will be any shear forces involved. The disk will be subject to an insignificant amount shear force caused by angular velocity changes with engine RPM it will also have some wind resistance created by the notches in the periphery. The only reason for dowels of other locating methods might be to ensure timing repeatability (say after reassembly) but otherwise holding the disk in place with three small loctited screws is all thats really needed. Just as an observation. The disk appears to be laser cut but looks more like SS than carbon steel, so I wonder if this for an optical sensor? Ian P
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Thread: How to machine out a metal channel by hand? |
24/06/2022 22:37:45 |
Not really solving the problem but your woodwork looks to be to a very high standard but how did you make it without a workshop? My thoughts on a solution to the diameter problem are that if the U channel really cannot be removed then reducing the diameter of the bent steel hoop by filing would be the best option. Even if its already painted then just file the 'sides' of the hoop so its ends up slightly oval leaving the upper paint intact. You could use an angle grinder with a metal grinding (rather than cutting) disk to carefully widen the gap in the steel channel but it would need to be done slowly to avoid heating the metal (and therefore destroying the bond of your adhesive) Ian P
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Thread: Internet/Organisation |
24/06/2022 22:23:02 |
Posted by Peter Greene 🇨🇦 on 24/06/2022 16:48:36:
I don't like to keep passwords on the computer on principle ... whether in text files or in the browser. Not to mention I have several computers. I use a password book to which is compact, organised and easy to carry.
Ian P
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Thread: VFD Cable Supplier Recommendations |
21/06/2022 12:25:17 |
Posted by Bountyboy on 20/06/2022 21:51:10:
Hello, I'm in the process of fitting a VFD to my lathe. The VFD manufacturer states I need to use 3.5mm2 shielded twisted pairs cable between the motor and VFD. Does anyone know where I can purchase 2M of this special cable? I've tried RS, Farnell and general searches on the web but to no avail. Thanks in advance As Mike said that is an odd type of cable, so odd that it probably does not exist. Ian P |
Thread: 13G? |
16/06/2022 16:42:55 |
I have a thread gauge (bought in 1959) that has 'Whitworth 55deg' stamped into the side plate. the 26 different blades (4 to 62TPI) all have 'G' after the number. As an example 12 TPI is marked 12G 1/2 9/16 but 13 TPI just has 13G (no diameter/s) as have 19G, 22G, 25G, 26G, 28G, 30G, 62G I'm not sure what the G means at all really Ian P
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Thread: Timing Belt |
14/06/2022 13:21:05 |
It is possible to identify a replacement belt in a situation where the tooth profile, the pitch, the width and the length are unknown but it requires a bit of effort. (jump to last paragraph for the easy way) There are quite a few different tooth profiles and whilst they may appear similar picking the wrong one will significantly belt life. Manufacturers catalogues might show detailed drawings of the tooth profile but if the pulleys are fitted with flanges and the tooth profile is not visible then its hard to compare and decide. I imagine that as Vic's belt is on a sander then it will probably not have any means of adjusting the pulley to pulley centre distance, therefore its essential to get the exact length of belt. one can work out the length if one can measure the pulley centres accurately but that is not always as easy as it seems. Measuring the belt pitch by counting the number of teeth on a sprocket which you know the diameter of is straightforward, so in conjunction with centre to centre distances you can consult catalogues and most likely identify what will fit. Far, far easier than measuring and guessing is just to Google spares with the product model number, most likely some of the results will include the actual belt manufacturers part number which you can then use to 'shop around' to find the best value supplier. Ian P
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14/06/2022 11:42:13 |
Seven or so replies to Vic's question and nobody has given him the details of the belt he needs! I wonder if its because we dont know the model number of the sander? Since Vic already has a price for the belt then whoever quoted must have more info than we do. Ian P
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Thread: Converting inch to mm in dxf and dwg files |
07/06/2022 14:58:00 |
If the holes are much smaller diameter than the material thickness then presumably they will at least put a centre mark/divot so you dont have to mark out the positions. Ian P |
07/06/2022 12:45:03 |
The laser cutting company (online quoting and ordering), I use has an online drawing editing feature that pops up if the DXF I submit contains any errors that might cause the cutting process to throw a wobbler. One can then correct small errors (or design simple parts from scratch) The submitted DXF's must have all the cutting lines on one layer, must have no text or dimensions and all lines must be unbroken ie converted to 'polylines' (in Acad). Online quoting means one can change material type, grade, thickness and other factors and immediately see the most cost effective method (where appropriate). Ian P |
Thread: Nut Making |
29/05/2022 12:00:29 |
Edited By Ian P on 29/05/2022 12:02:25 |
29/05/2022 11:44:15 |
Posted by Ady1 on 29/05/2022 09:26:45:
As wealth increases a society gains more silly government drones who enforce more and more silly government regulations which strangle human endeavour 500 tears ago it was silly clergy drones forbidding human endeavour Al these "rules" people generate zero wealth for society After we got shot of the clergy 500 years ago (100% redundancies) we got the British Empire and the Industrial revolution Henry was a selfish twit but the law of unintended consequences meant he changed global history edit More recently we got rid of the EU drones and now we are starting to do the industrial and innovative things they wouldn't allow us to do plus ça change, plus c'est la même chose “ – the more things change, the more they stay the same Edited By Ady1 on 29/05/2022 09:33:51 So what are the things we can do now we dont have the EU drones? Yesterdays announcement about imperial measurements is really going to make a difference, not! Ian P |
Thread: Again - another whatsit |
28/05/2022 11:57:24 |
A few observations based on the one picture. It has an odd combination of features. Obviously the indicator and the part spherical objects are high precision but the chassis or frame of the thing do not seem to be in keeping. The indexable handle looks to be a budget diecast/painted item and the single visible hex--headed bolt looks to be the only fastening holding the narrowest ends of the slotted plates to the part carrying the handle, so the bolt would need to be very tight to prevent rotation. I wonder what the 'tyres' of the two wheels are made from? they look more like mother of pearl than some engineering material! How many of the part spheres are there and do their bores tie up with anything on the device (like thread or bore size) Ian P |
Thread: Finnish on Test Piece |
26/05/2022 20:48:31 |
I suspect the most likely cause of the chattering/rough finish is most likely due to the chuck not gripping the workpiece firmly enough. The slightest amount of bell-mouthing (or the reverse) of the chuck jaws would have the effect of only gripping firmly at one narrow axial position along the bar rather than over, say, 30mm of its length. Ian P |
Thread: Anyone know what these are called? |
11/05/2022 17:15:03 |
For anyone with Sky catch-up (or whatever it would be called) I can recommend a programme I saw yesterday evening on Sky Arts, Channel 11 on Freeview. Programme was called 'Journey into Infinity' and its about MC Escher who must be the worlds master on tesellation. Ian P |
Thread: Supplier of 7/32" Dowel Pins Please? |
22/04/2022 23:06:47 |
Posted by Martin Kyte on 22/04/2022 22:14:38:
If you use silver steel and harden ,just be aware that the diameter will get bigger. Some reduction will be found on tempering but don't just assume that the pins will remain the same size. regards Martin How does hardening silver steel increase its diameter? Ian P |
Thread: 400mm V band clamp, how to make? |
10/04/2022 21:54:13 |
Posted by Circlip on 10/04/2022 12:28:33:
You're looking for "Vee clamps", used to make thousands at 'Smith & Johnson' taken over by 'Eminox'. These people may be able to help :- https://abbeyclamps.co.uk/products/bolt-clamps/v-band-clamps/. Easy to make if you have a ring roller with shaped compression rolls. Regards Ian. I dont have any way of rolling my own rings (or any way of milling a 400mm diameter ring!) so will make enquiries at the two companies suggested. Ian P
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