Search Results for 'zan'

[JasonBModerator @jasonb]

Thanks Zan, if you have a look at my post dated 17th Jan on this page you can see my setup of a piece of crankshaft material held in a collet to locate X&Y, blocks to locate in Z and the last photo shows the mark on the rim which was lined up with a pointer held in the spindle.

Ron, if you have a spotting drill that can also be used as a Vee cutter held vertically above the work's ctr line. Another option is to hold the work with it's axis vertically and plunge down with a small diameter cutter to take out half circles.

[Clive FosterParticipant @clivefoster55965]

Mark

Glad you have got the electrics thing sorted out.

PM me your e-mail address, can't send stuff via this site, and I'll put a data pack together for you covering the Erskine drive. Do you have a Bridgeport manual? If not I can include my wiring diagram and find an appropriate download link for you.

Easiest way to put the head on is to fix a stout bar pointing vertically up to the table and grab it with a collet in the spindle. Then the table and knee feeds can be used to align the head with the bolt holes. A few extra strategic supports (wood offcuts?) wouldn't hurt. As I recall it I used a 3/4" bar stuck into a 6" (ish) thick lump of timber clamped to the bed when I sorted my head out after buying the machine around 2004/05. I made sure the nose of the quill was set down hard on the wood. After so many years I no longer know if such a thick lump of timber is needed. This time round I shall use a special removing support made by welding a blank end R8 arbor to a 1" steel plate.

Sounds like Zan has done what I briefly considered doing when I got my Bridgeport back in 2004/05 but VFD boxes were way to expensive then. (Especially when a proper, commercial, 440 V output static converter surfaced at £35 and I had a motor in stock to make it a rotary.). I expect his circuit will do you just fine.

This is an example of a commercial VFD set up for a Bridgeport as supplied by Power Capacitors UK (the Transwave folk).

I grabbed it a few months back as the price was right and it was just down the road but I'm unsure if its exactly what I want so I might sell it on. That one is a vector drive unit and the guy who sold it to me said he didn't have any motor heating issues at low speeds despite not having an extra fan to help keep the motor cool. The man who used the Optidrive also made no mention of needing an extra fan.

I'm given to understand that modern Vector Drive inverters are much better at giving the motor exactly the right amount of power at exactly the right time so low speed heating isn't such an issue in machine tool use as it was with the older Voltage/Frequency types.

Considering the single speed toothed belt drive conversion I found a decent belt length and centre distance calculator at Technobots :- **LINK** and ran the American L section belt and pulley data through it.

For the two 40 tooth pulleys and 92 tooth belt the centre to centre distance comes out at 9.75”, 274.65 mm which looks right when waving a tape at my Bridgeport.

Can't quite get that with an 8M20 belt and pulley set. For same speed 1:1 drive nearest is two 36 tooth pulleys and a 105 tooth belt at 276 mm centre to centre distance. Closest I could fined was a 44 – 48 pair giving almost 10% speed reduction at 275.9 mm centres with 115 tooth belt.

I shall probably go for the 115 tooth 8M20 belt and 44 – 48 pulleys as having comfortably more load capacity and running the motor a little faster to help with low speed torque and cooling. Objectively the differences are pretty much academic really.

Clive

Edited By Clive Foster on 27/01/2021 14:20:14

[Mark O’CallaghanParticipant @markocallaghan42477]

@ Clive Foster I understand using the tap for the 220v and the earth shield. Where does the neutral from the single phase go to? Also could you PM me a copy of the wiring diagram please.

@Zan, could you PM me a copy of the diagram you used as well please? I may go down this route eventually. At the moment I have far to many things to do.

[ZanParticipant @zan]

My Bridgeport was converted 10 years ago

ill post the circuit diagram in the morning, but

1 rip out all the fuses and anything between vdf and motor

2 wire the vdf directly to the motor use the reverse switch to control only the digital inputs to the vdf or you could inadvertently reverse while motor is running Don’t ask……….. I did this while testing after fitting a new drive shaft and forgot…. new vdf a month later……

3 my transformer has a 220 v input and a 440 so former used to give power to the control contractors and the power feed the 12 v is great for led lighting

4 a single 240 contractor was wired up for main power on with a new pair of push buttons on the control panel  I don’t like 240 v going here, but there was no choice  all 240 v power is fed from here to vdf, DRO and an external drive socket 

5 the motor control contractor now just triggers the vdf enable digital . I like this because it enables a satisfying clone when turning on ans enables using my knee to turn off

6 (edit) both the micro switches in my power feed failed by age cracking. So replace these while you are at it!

Edited By Zan on 26/01/2021 23:06:27

ps I run the motor at a fixed speed using the vari speed unit, but it’s noisy and I’m thinking about changing to a direct drive as indicated above. Just worried about cooling the motor at low speeds. The fan at the moment draws a lot of air through the head to cool everything 

Edited By Zan on 26/01/2021 23:17:14

[Turbine GuyParticipant @turbineguy]

Posted by Jouke van der Veen on 21/01/2021 20:33:49:

Emco C5 spare parts etc. can also be bought at Emco Holz & Hobby in Austria.

Thanks for the source. They appear to sell the collet holder I thought would be ideal for me as shown in Holz & Hobby This source could be useful for other EMCO parts.

[Roger BParticipant @rogerb61624]

These people have them, but I don't know if they can deliver to the UK at the moment.

https://www.maschinen-werkzeuge.com/de/spannzange-er16-o-12mm.html

[Michael GilliganParticipant @michaelgilligan61133]

Nigel wrote:

“I've not managed to establish the number's meanings”

.

.

Dimension D2 is the relevant one, Nigel

**LINK**

https://us.rego-fix.com/system/files/docs/2017-09/RFAG_TD_ER_Spannzangen-Masse_EN_0.pdf

MichaelG.

[peak4Participant @peak4]

Ketan, I appreciate this might not affect you directly as it's concerned with EU>UK imports post Brexit, rather than vice versa, (and I think regardless of a deal.)
In a way, it seems to put UK buyers, from EU vendors, in a similar position to your EU customers.

If I've got my head round this correctly, the UK (and I think the EU) are removing the VAT exemption for low value imports.
At the moment in the UK, the VAT and any duties are collected by the carrier, and are due before final delivery; hence Royal Mail etc, leaving a card at the destination address detailing fees to be paid, and their admin charge for that fee collection. (Currently as we are within the EU, so long as VAT is collected at source at the appropriate rate for the vendor's country it's all OK)

When the rules change, VAT is to be collected by the vendor (if commercial, as opposed to a private sale), and must be paid to HMRC directly by the vendor.
In order to make this payment, the EU vendor must create an account with HMRC, for which they are charged a fee.
I believe this applies to non UK landed goods.

There are various press reports about this, but many are behind paywalls; This one explains the gist, and refers to some Star Trek items which is what caught my attention originally in The Times. (Paywall)
https://toyworldmag.co.uk/post-brexit-vat-rules-set-to-cause-significant-impact-on-trading/
https://www.thetimes.co.uk/article/its-vat-jim-but-not-as-we-know-it-william-shatner-laments-post-brexit-rules-5t26rdd6k

Freight forwarders ebay etc. seem to be able to collect the VAT on behalf of the EU vendor, and pay to their HMRC account.

This document seems to go some way towards explaining the situation, see para "How will the operation of VAT change after Brexit?" et seq.
https://www.instituteforgovernment.org.uk/explainers/tax-brexit

A small vendor may well feel that it's too expensive, or too much hassle, and thus not register with HMRC and so not be able to export into the UK.

An example came up on another thread on here where someone was pointed to an EU seller of some collets which aren't common in the UK.
If that vendor doesn't register with the HMRC, they won't be able to export here directly.
Indeed, when I looked at their website, I got a warning flag stating delivery only to EU (along with a couple of other countries, Suisse and Koweit sic.)
https://www.georgessavoie.com/en/store/collets-zugspannzangen-2/product-1.html
[Similarly, if you look at Stefan Gotteswinter's site, he doesn't currently export his precision stones to the UK.
I think this was due to the previous deadlines before the implementation of the withdrawal agreement]

Bill

Edited By peak4 on 10/12/2020 22:35:23

Edited By peak4 on 10/12/2020 22:36:58

[John HinkleyParticipant @johnhinkley26699]

Posted by DC31k on 14/09/2020 14:37:31:

Posted by Alexander Smith 1 on 14/09/2020 13:11:58:

…Schaublin P9 collet …then hen's teeth are common in comparison

M. Georges Savoie must be feeding his hens something special then:

https://www.georgessavoie.com/en/store/collets-zugspannzangen-2/product-1.html

They are secondhand, though. So to be fair they should be called hen's dentures!

John

[Grindstone CowboyParticipant @grindstonecowboy]

Hi br – it was kind of a running joke in our office to mix the punchlines up. Similarly, "look at that one-eyed cow over there" was responded to by covering one eye and saying "Where?", when the real joke should be "look at that cow over there with one eye".

Apologies, and finally, what's white and swings through the trees?

Tarzan the fridge.

Rob

[Gary Clarke 4Participant @garyclarke4]

Thanks All for the comments and suggestions. I think improving the ridigity is a good idea. I will lock down all the unused axises (axiii?). Zan's suspicion is likely any accurate assessment.. can climb milling be avoided by reversing the spindle or ?

Gary

[ZanParticipant @zan]

What moved? The vice? Vertical slide?
I suspect though as already said the slides should be very securely locked.
i think this is mainly a backlash issue. I bet you fed in towards the centre to position the slot. I.e pushing the slide in. The normal cutting tool in turning will be forcing the slide out against the thrust bearing on the screw. Your cutter does the opposite and will pull it in away from the thrust bearing. So you are effectively suddenly giving a setup with little intrinsic rigidity a climb milling situation , and all the backlash will be taken up, thus once any inevitable snatch starts it will rapidly increase

perhaps a way forward is to make it a slightly elliptical slot by starting a cut at the back and feed in FPS out from the lathe centre a trace then go back, increase the depth and repeat . You will still be climb milling but the cut will be of a significantly reduced length rather than the full periphery of the cutter. Best to experiment on an unimportant bit of stock

Edited By Zan on 30/11/2020 18:56:47

[Howard LewisParticipant @howardlewis46836]

When 3 cylinder aero engines are mentioned, the Anzani immediately comes to mind.

Wasn't it a 3 cylinder that brought Louis Bleriot across the channel?

Howard

[JasonBModerator @jasonb]

The Anzani and Cygnet Royal both used alloy castings for the crankcase, Les Kerr's one is a likely candidate as that uses brass hex. ME 4308, 10 & 12

[John PurdyParticipant @johnpurdy78347]

Finley

Not sure if this is the one you are looking for but L.W Chenery wrote a build series in ME on the Anzani 3 cylinder aero engine of 1910 starting in Me volume 177 1997 #4022 and ran for 11 parts.

John

[ZanParticipant @zan]

For my sx2 p cnc conversion I used the R8 spindle this was used with a 3/4 collet and the cutters are mounted in 3/4” silver steel chullets. They are very very carefully clocked in the 4 jaw then drilled, bored and reamed for the cutters held in place with 2×2 ba grubs. Height location is with a 5/32 silver steel bar registering against a machined ring ( in situ) on the end of the spindle. Photo 2, offsets are set off machine in a dedicated setting device seen in photo 1 . It’s highly accurate and the silver steel cost little from a specialist supplier near Harrogate

The advantage of this system is it is ridiculously cheap and has a very very small extension unlike many er chucks , and as Ketamine says, the sx2 is a mini mill and thus the more we can help it the better

The height is set with the dti device in photo 3 it has a length of 115 mm when the clock reads zero when in contact with the work

23

 Sorry about the aspect ratio!
once the cutters are fixed in their holders the size is recorded from the setting jig in the Mach 3 tool table, and in addition into Fusion 360 which I ciponstantly use for 3D cad and cam code production.

The machine is very well used.   Pm me for more info

Edited By Zan on 21/11/2020 23:34:13

Edited By Zan on 21/11/2020 23:38:57

[JasonBModerator @jasonb]

Regular forum followers may have seen me mention that I was working on something but could not reveal more detail at the time. However I can now say that I have been collaborating with Graham Corry of Alyn Foundry an a new engine to extend his existing "CHUK" range

From Graham:

"CHUK " V "

The Vee Twin, my liking for them possibly inherited? Dad drove and competed with Morgan three wheelers through the late 40's and early 50's fitted with engines from Anzani, JAP and Matchless, he loved them.

As a natural progression my CHUK range developed starting with a vertical then an inverted vertical and onto a horizontal. The engines were conceived on a modular basis so the same patterns and castings could be used over and over keeping production costs to a minimum. CHUK 4 ( an inverted vertical twin cylinder ) is still in part built form and will be finished when it's finished.

The Vacuum, flame licker/gulper engine is one of the simplest to build and equally easy to run. This was the main reason for its choice as a build project aimed at novice entry level to model engineering.

I mentioned the concept to Jason Ballamy whilst he was helping me with some patterns for my long term project, the Brayton Readymotor. Within a couple of days I received 3D images of my concept via email. Several more interchanges later and CHUK " V " became a reality. To see a pencil sketch become wood then metal in a fraction of the time it used to take shows the amazing power of CAD and CNC . CHUK " V " ? Well the Roman numeral for five is the letter " V " quite an obvious choice really. Whilst the concept is mine due credit must go to Jason who has virtually designed the rest of this engine.

The number 5 will predominate in this particular build and my choice of using Aluminium instead of good old cast Iron is based upon a chance sighting of a Stuart Turner " bottle " steam engine. I was really taken by both the shape and nicely polished surfaces. Cast Iron is still in predominance as both air cooled cylinders, pistons and heads will be made from it. The engine will also use my recently improved " rotary " valve and
" Chipmaster " exhausts.

What will follow is our documented collaboration of a new engine from the Alyn Foundry stable. Some Iron castings are still on order but the Aluminium crankcases arrived yesterday from my dear friends at Madeley Brass. Hopefully we'll see a working Vee twin vacuum engine for our efforts or perhaps a nicely polished door stop? Time will tell….

Now over to Jason…."

[Sam StonesParticipant @samstones42903]

Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn’t mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

I cdnuolt blveiee that I cluod aulaclty uesdnatnrd what I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it dseno't mtaetr in what oerdr the ltteres in a word are, the olny iproamtnt tihng is that the frsit and last ltteer be in the rghit pclae. The rset can be a taotl mses and you can still raed it whotuit a pboerlm. This is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the word as a wlohe. Azanmig huh?
Yaeh and I awlyas tghuhot slpeling was ipmorantt!

**LINK**

[ZanParticipant @zan]

Andrew. He said……“ I have bought some second hand 2", 3" and 4" micrometers. Is there any way to check that they "zero" correctly without using a block of known size?”

The only way to zero a 2” micrometer is with a 1” standard you refer to a 1” micrometer 

 

Edited By Zan on 12/11/2020 19:45:27

[egaParticipant @ega]

Posted by Zan on 10/11/2020 23:19:48:

If you get a new Chuck go for a 4 jaw self cantering. They give a very solid grip on material are incredibly accurate and contrary to popular belief they still grip hex material on centre. Despite the warnings above, my 125 mm has been on my well used S7 for 20 years with no ill effects

Interesting suggestion and I didn't know about the hex point.

I can't help feeling that a 4J SC would have to have exceptional accuracy for each jaw to bear equally on round stock. I have got one which I use for non-critical holding of cold-rolled square bar but for accuracy and grip would use the independent 4J.

[Dave BarrParticipant @davebarr43722]

Zan, thanks for your reply. I know swivel bases don't suit everyone but the things i do and the way i work I find them very useful. Good point about the drive and swarf I'll maybe re-site it or perhaps make a guard from acrylic sheet cheers!

[ZanParticipant @zan]

There’s fundamental problems with Tom’s tables in the past I have used them but i became exasperated with my copied tables until I realised the error
why? His speed for a 1/4” 4 tooth endmill is 960 in steel with 1 -3/4” feed , yet for a slot drill it lists 1600 rpm and a feed of 3” min. He has the headings the wrong way round! If you follow this point then the tables are very low in cut per tooth

using the 4*cs/ dia yields 1600 rpm ( cs= 100 fpm) Using a feed per tooth as recommended between 0.0005” and 0.002” this yields a feed rate of

fr= rpm x no of teeth x feed per tooth

= 1600*4* 0.001= 6.4 Inches per min.
Tom’s numbers are at the bottom of this range, and he states the tables came from Clarksons Autolock Chuck data.
with more modern spiral endmills with various coatings and the increasing use of carbide cutters in the home workshop, his tables aRe becoming outdated

Edited By Zan on 06/11/2020 21:25:40

[ZanParticipant @zan]

Strange! Inconsistent errors. This is where slip gauges are a help

1. Carefully check all the mountings fir movement also the x slide screw, thrust bearing and the nut ( unlikely but it’s for elimination while you are at it, check the gibs) check there is no movement on a dti while the x slide is being locked

2 clamp a block of known size say a 321 block with a bar of flat clamped to it extend beyond say the headstock end So giving two test faces in the same plane
use a dti to set it parallel then feed in to zero on tthe block with the dti then zero the x slide dial n DRO. Check on the clamped bar. After a small movement to clear with the saddle
this will check the DRO and the feed screw

Ha! Some similar comments while I was thinking about this n typing!

Edited By Zan on 25/10/2020 09:53:17

[OldironParticipant @oldiron]

Posted by Zan on 11/10/2020 13:39:18:

Tv programs with what will happen in the next part. Very annoying if it’s say part 4 of 6 drama series and it’s a critical point with the story line hanging. If it’s been watched fir this long, why do I need to know what’s next

In a similar vein previews and reviews before and after adverts , is this a way of expanding material to fill the the actual time needed?

Advert intervals which are not 4 mins it makes the time jump on playback trying….. Esp when sometimes it’s only 2 mins…..we never watch things live, saves hours of time a week…..

I watch almost no tv these days but my wife noticed a program I might enjoy so recorded it for me. I was very miffed when the 1 hour program turned out to be 19 mins long if you cut the adverts and the prefaces and suffixes from it. regards

[ZanParticipant @zan]

Thanks sod and David. Yes I missed the 9-7 at 4.1 ohm I discovered that at 2 am as there was no way for this to happen in a delta connection and found the 7-9, with repeated meter readings, and thus 78&9 could only be connected as a star, after 4 sheets of attempted drawings being the only possible way it would work . However by that time my head was spinning Too much to post!
I was under the impression that any star connection would not work at 240 v however after a lot of trawling with the Dahlander connections (thanks John, the actual name of the connection was a great help) I did find one reference to a star working at 240v but John’s diagram now makes this abundantly clear…

it seems that it was connected in the only way it would work and actually there was no problem at all! That’s The trouble with limited understanding, it’s hard to actually pin down to a faulty motor or inverter, and which caused the problem, one ,the other, or both!

However it’s very good to be absolutely sure I killed this inverter with the momentary disconnection of the motor while changing direction, although it did take a while to actually fail , the first Inverter was I think just bad luck. So now a decision, a cheap £70-90 inverter off the bay or a decent Modern vector type at £180 plus……

I think the latter, as I am contemplating removing the varispeed head because of noise in a home workshop , it’s fine in a massive industrial or educational environment. But I have to use ear defenders all the time when using the machine then the inverter will provide the speed change and I’ll use a multi groove belt .  I enjoy messing about with machines, after building my first lathe as a final year project at teacher training, built a Dore west bury miller, converted a sieg sx2 to cnc and much modified my decker type tool and cutter grinder 

thanks to all

 

Edited By Zan on 11/10/2020 10:51:39