Search Results for 'zan'

[ZanParticipant @zan]

Rocol mts 1000 I think is the correct stuff, but I ran out a long while ago. It’s a graphite grease supplied in a tube. Can’t find any now So grease I think will be ok but not on the main leadscrew, that would enable too much dross to bond onto it and spear the half nuts

Edited By Zan on 28/08/2021 11:44:11

[Martin KyteParticipant @martinkyte99762]

Posted by Zan on 15/08/2021 10:06:21:

You beat me! The cutter is locked when it hits the work piece causing it to rotate more slowly than the holder, thus screwing the collet taper out and locking against the cutter shank thus stopping further rpm drag

Yes if it's too loose but it still cannot move axially if it's up against the male centre in the body.

regards Martin

[ZanParticipant @zan]

Stevi. , o had one like that, but the arms were too weak with little metal either sine of the adjusting screw. They bent in use when the screw was tightened. Useless went in the bin. Got a really decent one engineer built, from a secondhand stall at donny

Edit. The poor autotype……

Edited By Zan on 05/08/2021 21:23:55

[ZanParticipant @zan]

Thanks Jason. Got it.  That was very quick!
thread closed

 

Edited By Zan on 02/08/2021 19:28:00

[ZanParticipant @zan]

Try some “Time saver lapping compound “ expensive, but outstanding performance and it’s non embedding so will not cause any long term problems. Google it

Edited By Zan on 29/07/2021 18:09:14

[Ramon WilsonParticipant @ramonwilson3]

Doc,

All I have written above is based on my own experience both at home and at work and is one of caution and definitely not 'you are going about this the wrong way' as such.

Obviously others have used this form of clamping with success but personally I would not go about it as you have it so far. If you feel happy with following the instructions or Jasons and Zan's thoughts then follow that conviction.

I am not saying it will go wrong, only that it might and if it does it's too late.

If you decide to bolt it to a plate and rely on the bolts to take the forces you really still need to clamp the cylinder otherwise all your cutting forces will transmit through the JB weld adhesion and four 10 ba bolts. Much as I advocate JB weld, and, if it has bonded well, it probably will I would not rely on it in this specific situation.

Ramon

[Dr_GMJNParticipant @dr_gmjn]

Posted by Zan on 27/07/2021 09:03:04:

Edit…..perhaps you should rely on the position of the feet holes as you seem to have positioned these very accurately setting these parallel to the lathe axis, then just centering at the headstock end

Hmmm yes perhaps it was a mistake to tap the bed holes. There is little room for adjustment within the milled pockets, even with clearance holes for the studs, and I’ve now got a disconnect between them and the cylinder axis, which itself needs to be a best fit to the flange O/Ds. So yes, I will put some short bar (or drill shanks) into the holes and check they are aligned (using a dial gauge) with the lathe bed before boring.

The instructions are a bit vague on all this anyway. It just says (after boring and machining the feet/holes) to assemble the pistons/cross heads, align on the bed and pop through to drill and tap “if you’ve not already done so”. It also mentions drilling and tapping the holes much earlier – when modding the beds – with no mention of cylinder lateral angular alignment at all.

This is why I did it as a have done – having a DRO on a mill seemed to make all alignments for the holes very easy, and enabled me to use the beds as a jig for feet fitting, whereas the instructions seem to assume no mill is available, and I doubt DROs were a thing back then (at least for the amateur).

I think the checks I did before bonding the feet are hopefully good enough, although no way will the wooden plug centre marks be within 0.010” – it was estimated by eye with a pointer.

And to Jason’s point: yes, the instructions show nothing but a piece of steel angle as a saddle clamp, with just two studs holding it down. That’s why I thought my initial method with flat steel, paper packing and four studs might be ok. The number of sliding interfaces did always concern me though.

[Dr_GMJNParticipant @dr_gmjn]

Posted by Zan on 27/07/2021 09:43:17:

Ah. Your beginner status shows again, but Iv been following your posts and your level of skill is impressive!

t bar, a very long t nut with tapped holes for the studs. Mine for the S7 are 4,2 and 1 inch long with holes tapped every .5” or so they spread the load and minimise the risk of damage. Also be careful the x slide is not bent when the clamps are tightened too much. I’ll provide a sketch of the clamping outlined above if you didn’t fully get it

Thanks Zan – yes I understand. I get the basics, and am happy to take time to get things right, but sometimes something just seems a bit wrong and advice is very welcome.

[Dr_GMJNParticipant @dr_gmjn]

Posted by Zan on 27/07/2021 09:13:14:

The problem with a strap clamp like yours is that all the down force could be on a single pimple point on the valve face, thus you only have in effect one clamping point with a very high force on it. This makes them a bit of a problem compared to 4 clamps . Do be certain to use t bars not t nuts or there is a real risk of breaking the t slot in the cross slide, there wupill be considerable force on them

Edited By Zan on 27/07/2021 09:14:38

Thanks Zan, what's a T-Bar?

[ZanParticipant @zan]

The problem with a strap clamp like yours is that all the down force could be on a single pimple point on the valve face, thus you only have in effect one clamping point with a very high force on it.  This makes them a bit of a problem compared to 4 clamps . Do be certain to use t bars not t nuts or there is a real risk of breaking the t slot in the cross slide, there wupill be considerable force on them

Edited By Zan on 27/07/2021 09:14:38

[ZanParticipant @zan]

How about a short turned plug in the feet, then clamp each down with a long stud stud, clamp bar sat on packing

then add additional clamp bars to the same stud but longer bars going outside the lower clamps, so you now have 8 clamps using 4 studs There would be room in the centre for a strap clamp as well

it has the additional benefit of making the clamp positions wider on the casting thus removing the tendency of twisting

with regards to the feet fixings, I think it’s a mistake to tap the holes in the base. The wood plug cantering is very inaccurate and could easily be 10 thou out at each end, thus the bore is angled relative to your base fixings. The easy way is to spot through accurate fitting using plugs in the finished cylinder with reamed holes and a straight bit of silver steel as a pointer. Set this up on the bed, clamp in exact position then tap the base holes. You may find that to correctly align the cylinder ot will need some small rotation so the feet holes will need to be pulled over to allow this . I hope not

Edit…..perhaps you should rely on the position of the feet holes as you seem to have positioned these very accurately setting these parallel to the lathe axis, then just centering at the headstock end  

Edited By Zan on 27/07/2021 09:04:08

Edited By Zan on 27/07/2021 09:08:09

[JasonBModerator @jasonb]

Zan, see this thread from Friday. It is being dealt with.

Both available on this site just numbers are the wrong way round.

[EmgeeParticipant @emgee]

Zan

Perhaps someone on the iO group will clarify the details.

The reason behind my note on the picture is that the gear driving pin is held in the indexing end and as the gear is at the rear of the engine No.1 cylinder is at the prop end so must be as shown.

Emgee

Edited By Emgee on 24/07/2021 14:56:44

[EmgeeParticipant @emgee]

Zan

The 3 plates were clamped as one when drilled and reamed to make sure the bearing bores were aligned, all indexing was done at the front as detailed by Eric in the write-up.

Emgee

[EmgeeParticipant @emgee]

Zan

Are you a member of the Whittle V8 engine build group on iO ?

If not advise you join at the following link, lots of info on that group from people who have completed the build.

**LINK**

Emgee

See note on my picture, cannot confirm this is correct though.

Edited By Emgee on 23/07/2021 14:19:16

[ZanParticipant @zan]

I’m at the stage of preparing to make the camshaft, but need to make the machining fixture and a travelling steady, Iv had the casting for 20 years…. Here’s the problem

The photo shows the drawings. Whittle does not fully explain in his notes about the fixture. (Me July 95 #82) The indexing wheel is fixed to the back of the camshaft , his photos of machining it show this at the right on the Miller. However the drawing states only the “ front indexing plate” so is this a view on the END of the fixture OR the view from the Front of the engine/camshaft. I think it’s the former but if I am wrong the engine will run backwards or not at all

Any guidance from anybody who has actually got the engine running would be much appreciated.

 

Edited By Zan on 23/07/2021 12:35:14

[Graham MeekParticipant @grahammeek88282]

Posted by Emgee on 22/07/2021 13:45:18:

Posted by Geoff Stenner on 22/07/2021 07:35:09:

Direktspannzangen, 7-teilig With MK2 New Collet Set | eBay

Any comments on these?

Geoff

All of the Emco 5 cnc lathes I have or had needed the small end of the MT2 arbor reducing in diameter to fully enter the spindle, seems they were built to accept a shorter length taper.

Emgee

Hi Emgee,

It is funny you should say that, as I spent ages getting a set of No 2 Morse Collets that did not disappear into the spindle. Those I have of Eastern origin, which I use on my 2/3 rds Quorn, all go in too far. While a set I bought made in the USA, and are years old, do not.

I must therefore urge Geoff on the side of caution if going down this route. The problem could be overcome by using a sub-plate screwed to the spindle nose and bored through No 2 Morse. This would ensure maximum concentricity and it would not need to be the entire length of the Morse taper. Just sufficiently long enough for the working portion of the collet.

This approach could be extended to suit other collets, provided the collet draw tube will enter the Compact 5 Spindle.

Regards

Gray,

[EmgeeParticipant @emgee]

Posted by Geoff Stenner on 22/07/2021 07:35:09:

Direktspannzangen, 7-teilig With MK2 New Collet Set | eBay

Any comments on these?

Geoff

All of the Emco 5 cnc lathes I have or had needed the small end of the MT2 arbor reducing in diameter to fully enter the spindle, seems they were built to accept a shorter length taper.

Emgee

[Graham MeekParticipant @grahammeek88282]

Posted by Geoff Stenner on 22/07/2021 07:35:09:

Direktspannzangen, 7-teilig With MK2 New Collet Set | eBay

Any comments on these?

Geoff

Hi Geoff,

I use these Draw-in No 2 Morse collets as well as my ESX 25. Whereas the ESX, and ER collets have a working range of 0.5 or 1.0 mm, depending on the nominal size of the collet. The Draw-in collets are a little more fussy and need to grip on a nominal diameter or very near.

When I worked on a Hardinge HLV lathe, the Draw-in collets of this machine, (5C) had a gripping tolerance of Nominal to minus 0.025mm or 0.001" set by the manufacturer of the collets. Deviating from this will not only ruin the collet but will seriously effect the collets original concentricity guarantee. These collets would never be used to hold barstock, only turned diameters.

The draw in collet does have an advantage over the ESX, ER collet in that it can hold a shorter length of diameter, especially if this diameter abuts a shoulder. However the gripping capacity of the No 2 Morse collet is inferior to the 5C in these circumstances.

Hope this helps

Regards

Gray,

Edited By Graham Meek on 22/07/2021 11:44:05

[Geoff StennerParticipant @geoffstenner57513]

Direktspannzangen, 7-teilig With MK2 New Collet Set | eBay

Any comments on these?

Geoff

[JohnFParticipant @johnf59703]

Michael, one way of removing the bricks is drill a series of holes through the mortar bed as close together as possible then use on of the carbide side cutting "drills" aka Screwfix etc that fit an angle grinder – works pretty well ! I had to fit a new lintel over a window and used this method suggested by a pal in the building trade, we also used the side cutting bit to remove mortar for re-pointing the brickwork.

As far as bricks are concerned there is a company close to me who manufacture many specialist bricks for all areas of the UK – maybe they can assist ? **LINK**

Hope this helps John

[ZanParticipant @zan]

Interesting concept but would  be better just using balance without the turntable

I suppose the druids would just pop down to the local timber merchant fir the very very thick planks needed to support the weight, feet thick? then get them to send a forklift to get the stone onto the top…

 

Edited By Zan on 04/07/2021 11:19:12

[Steve Skelton 1Participant @steveskelton1]

Zan, you need to be a little more precise with the description of your electrical installation before anyone can advise you on potential problems.

Is your workshop within the confines of your house or is it a separate building? If it is separate then the earthling arrangements for your workshop may need to be separated from your house.

Ideally, your workshop should not be fed from the house consumer unit by a ring circuit. Does this circuit have any RCD protection at the origin?

I have never come across a domestic 24A circuit breaker. If so what type (tripping characteristics does it have)? Do you have RCD protection within the workshop?

Have you had the wiring tested to ensure all of the protective devices and wiring are appropriate?

From the sound it I think it would be wise to get an electrician involved who understands inverters – you may have the incorrect type of MCB fitted if there is a fairly large inrush current – if it is a B type circuit breaker you may need to change it to a C type.

Sorry, I can’t be more help – there are too many unknowns.

[Anonymous]

Posted by Zan on 04/07/2021 00:10:55:

Could this be a problem with the built in filter, as indicated above which a parameter change can disable….

Unlikely. Contrary to the statement made by SoD many inverters (especially cheaper ones) do not have built-in EMC filters. Even if the inverter had an EMC filter it is unlikely that it could be bypassed via a parameter as it wouldn't be simple to disable the filter electrically.

It's not clear from the post if a breaker (over-current) or RCD function is being triggered?

Andrew

[Tony Pratt 1Participant @tonypratt1]

Posted by Oldiron on 27/06/2021 11:35:12:

Posted by Zan on 26/06/2021 23:47:18:

What speeds and feeds are you using?

Stated in the post.

regards

Where?

Tony