Jump to content

Class 850 / P1 Gauge O Works

Rate this topic


murrayec

Recommended Posts

This model has been on the workbench for some time now, it's a Brendan Kelly/Hamill built model. Now that a number of projects are complete I can dedicate more time to get it finished.....

850-0120220124_180328.jpg.119a1887ee501cecb6c001132adf9ac9.jpg

850-0220220124_180344.jpg.48c32956d3e66f377ff9f01f2d5ed0cc.jpg

850-0320220124_180408.jpg.49ca9652fd18ef76bff5ca297f9b82e7.jpg

850-0420220124_180418.jpg.48fbc9e8712a9f2e025b9a9eb2ebe69c.jpg

850-0620220124_180455.jpg.2be98c64c7c62dc829a43a295e1624f1.jpg

After having a good look a it and a bit of photo research a plan of action was worked out. The model has been prematurely painted as it's lacking a number of critical parts;- cylinders, valve gear, coupling rods, brake gear, cab opening details, cab roof rain strips, electrical pickup system, footplate frame details and buffers. Although it looks fine with paint on, there are a number of locations on the body that solder could be removed to improve the detail- so it was decided to remove the paint and start there.

850-0720220125_120242.jpg.0dffdc645a1a2e7ac4ff64467a136309.jpg

Sand blasted

850-0820230307_103824.jpg.1d01900b76fc4fbfd833b43ebb557b4a.jpg

Bits were acquired and the electrical pickup parts are prepared.

850-0920230308_121140.jpg.6f6e1b03ac51ee993e9a900fbfa2ca07.jpg

850-1020230308_121151.jpg.a33e5eafd9475fee50391254e76a1121.jpg

Solder clean-up almost complete.

850-12CADScreen-01.jpg.a4440827e27bdd271113b1ffbdfc0006.jpg

This is a screen capture of the CAD drawing, the drawing was done to work out how to make the cylinders, crosshead, rods, brakes, and a few other bits, the drawings of parts are extracted out to the right, for CNCing from metal sheet.

850-1120230321_170829.jpg.7b32372d2c8b16ce53f948fc3bdc0cf7.jpg

These bits are the tools for making up a new steam dome, there are tools for both Gauge O & OO. The long round bars are the boring bars for turning the base of the dome to fit on the boiler. The short round bars and screws are for mounting the dome in the lathe chuck to form the top curves. The square bars are for holding the carbide tools while sharpening them on the grindstone. There is another square bar yet to be made for holding the work piece in the lathe tool post while the base curve of the dome is being cut.

More later......

Eoin.

 

  • Like 7
  • WOW! 2
Link to comment
Share on other sites

1 hour ago, Galteemore said:

Interesting, Eoin. Stripping the paint off actually reveals that some good work has been done on the body - with some interesting omissions such as not rounding off the Belpaire edges.

Yes, Brendan does great work, but often gives the model to the client before its complete, this is where people contact me to do the completion- if I can!

The Belpaire edges are on the list.

Eoin

  • Like 2
Link to comment
Share on other sites

  • 2 weeks later...

850-1320230328_155718.jpg.9bad3386f8cecb7072fa044c7efcf8e6.jpg

I removed the dome, the chimney, handrail knobs, one short cab handrail, and the snifting valve. While assessing the model I had noticed that the chimney was off centre, I was going to leave it alone but when I had the model hot decided to remove it to correct it.

850-1520230328_172525.jpg.c25bcb6f5d0074b19ecc02b6bd3ed0d6.jpg

850-1620230328_172542.jpg.bcc2459280e29df1250e5a73bfdcae40.jpg

Again while the model was hot I did a few repairs to some of the soldering, this all had to be done on the outside as there was no access internally.

850-1720230328_172601.jpg.0f7a9d5f81d910d58ebc947a26c18dee.jpg

This is where the short n wonky cab handrail came from, the bottom hole is way off line so a solution is needed to fix this. That hole at footplate level will have to be filled with plastic filler when at the painting stage.

850-1420230328_172514.jpg.f3171878174d7d5239611f87c504cbd5.jpg

The body being cleaned up after repairs n parts removal.

850-1820230328_183825.jpg.75f0d53ce8c0383a227198f207aca12b.jpg

The smokebox door had a raised number plate on centre, so that was filed off, new holes marked up for a dart handle and upper handrail.

850-1920230328_183851.jpg.252bea7e3522afef18123d9ab444f8c6.jpg

While working on marking out the frames detail to be added to the front footplate I noticed that the right side buffer hole in the beam is off line by 3mm, when the frame pieces are installed this would be very noticeable so I reckon we need a new front buffer beam!

Eoin.

 

  • Like 9
Link to comment
Share on other sites

  • 2 weeks later...
  • 3 months later...

Having a go at the new steam dome;-

850-2020230729_121014.jpg.16ef6df4d796ecc52cdb6b6836f3154a.jpg

850-2120230729_121022.jpg.4c8883608847c70e3edf83b754252be6.jpg

After working out the sizes (I also decided to make a new chimney- slightly smaller then the one removed), two slugs of brass were cut from bar- 22mm dia for the dome and 15mm dia for the chimney.

850-2220230729_133815.jpg.c9931f9117f692b2905410b9217c7e57.jpg

The dome slug in the chuck just about to be tapped M4 for mounting in the toolpost bar to cut the boiler curve on the base of the dome. The radius is 17.5mm

850-2320230729_161556.jpg.716900e082fecd348ab6dd3569317c45.jpg

Now mounted on the toolpost bar, set at 90 deg and ready to fly cut.

850-2420230729_164747.jpg.7eda29bdc4fba3a3b91999f08f6c1fc2.jpg

Cut- slightly out of focus! The mounting bar required 3mm packing to get the work-piece centred on the axis of the lathe. The first light cuts show if your on centre, then one packs out until the cut is centred on the tapped hole.

850-2520230729_164810.jpg.11355e8641bd5c1924d728b7dea55a8d.jpg

850-2620230729_165109.jpg.ec89f3c247b363f90d32fc5363c901db.jpg

Checking fit.

850-2720230729_171354.jpg.82091851633ffc093d4b0695ad6d44b8.jpg

A recess is bored out of the base for the work to be mounted lock-face on the mandrel.

850-2820230729_172346.jpg.a916553394f719fed40118bb8b11b995.jpg

Now the work-piece is mounted on the chuck mandrel.

850-2920230729_172429.jpg.3fef826deb69814721a1018f4dbd7cfb.jpg

Ready to cut the side.

850-3020230729_180508.jpg.c5399ed8df00edf7467a374eac5d750c.jpg

I estimated the sides to be at an angle of 10 deg. so the topslide was set over to 10 deg and the cutting was done with the topslide to get the taper.

850-3120230730_102211.jpg.59c5fdaea8787fe947c214e21575262d.jpg

Taper complete.

850-3220230730_113152.jpg.7013b9f75ed06878930a0a503a7420b2.jpg

850-3320230730_113207.jpg.bf2c4f0f57150d3829d6d8177f4859d3.jpg

This is the tool setup for cutting the top curve, it's a Ball Turning Tool mounted in the toolpost with the cutting tool set to cut a 19mm radius curve, the lathe is run backwards in this set-up as the tool is cutting on the backface of the work.

850-3520230730_123930.jpg.03ff000884341a8525440f97e9cfef34.jpg

Curve done, cleaned up with files and emery paper.

850-3620230730_130054.jpg.f81cf43a360fe86df5de43b1dacbf0ba.jpg

850-3720230730_130412.jpg.2411cebf209bc6fdd74c21ffd42aab0a.jpg

Test fit.

850-3820230730_155520.jpg.2fa8d84ec343d5de4724075d8e70d772.jpg

850-3920230730_155503.jpg.24258452c0dd4dbcef6d836c27509390.jpg

M4 brass screw fitted.

850-4020230730_174250.jpg.d87ed3db9a4081d8f9bb83102ea1cd87.jpg

I engraved a bead line around the base of the dome with the point of a calliper/divider.

850-4120230731_144442.jpg.9de794a3701903e327f4bbf0b9595eb1.jpg

Then back into the chuck to turn down the M4 screw to imitate a top nut on the dome. The screw is Locktited in first!

850-4220230731_150929.jpg.47defc8b14b4dcc24a0eb44d5f6a2f6d.jpg

Next the chimney, this is my setup for threading on the lathe, the slug is in the chuck after being drilled through, I disengage the drive motor, mount that handle to the left in the lathe mandrill and rotate the work with the aid of the handle while pushing the tailstock along the lathe bed- tapping the work.

850-4320230731_160237.jpg.6d17a88d71452a053d1c3958aab33504.jpg

Fly cutting the curve base of the chimney. The radius is 19.5mm.

850-4420230731_163454.jpg.305cb1b12d6b962264e962ebfeca5092.jpg

The work is then drilled through with an 8mm drill. One has to have a hole in a chimney.....

850-4520230731_163911.jpg.c63a755614ba1887a54b71a2208c6a60.jpg

To turn the outside of the chimney the work is mounted on an expanding mandrel, it expands when tightened up and holds the work for light cuts.

850-4620230731_164255.jpg.d23e7ae4788b016cfd50658240062e27.jpg

Mounted in the chuck, the tail stock can be used here to support the work on the right but it gets in the way in what I'm doing, so light cuts are a must with so much overhang!

850-4720230731_172155.jpg.dd61ab1be9252262ecbe391071f989c6.jpg

850-4820230731_172203.jpg.c925f40da64225cdfa72271d20e383a0.jpg

Rough cuts with a parting tool.

850-4920230731_174439.jpg.a8d1e0107a2e16f3d0f163992431ee92.jpg

Finishing cuts with a round tool.

850-5020230731_181945.jpg.24d4957ffc398c4ae451123cbcf05cc9.jpg

Filling down the sides, top one is done with the bottom yet to be.

850-5120230801_103954.jpg.d78fcff25a5cd9aa174a02ab70d5ea70.jpg

Complete.

850-5220230801_104115.jpg.85f09c19887f4cc62584db1549cf5d81.jpg

Test fit.....

850-5320230801_104148.jpg.83b7cbb23826701326ad831c0630ece4.jpg

.......and comparison with he one that was removed.

More later

Eoin

 

Edited by murrayec
  • Like 7
  • WOW! 7
Link to comment
Share on other sites

  • 1 month later...

Work on 850 continues;-

850-5420230812_222441.jpg.1afe8bda01bad69afbf2e7c5a8be7eb2.jpg

850-5520230817_122327.jpg.04c9fdb3769b11cff8e4db7252032889.jpg

Parts cut out on the cnc machine and cleaned up.

850-5620230904_121829.jpg.859827cdbf934b0d1723171193057130.jpg

When starting to set up the cylinders I realised that the chassis first needed its fixings to the body so I could work out the space I had to work with- the front of the cylinders are rather close to the front footplate down-turn. Also, the front valance parts need to be in place.

850-5720230904_155036.jpg.b01883269d6c40efea1b724f465ebe25.jpg

850-5820230904_155109.jpg.3b31a76d52ef0628d06cedabfc415d15.jpg

The front of the chassis will be held by a tab soldered to the underside of the footplate with a cross piece across the chassis frames to slide into the tab, the rear will be screw held to the body under the bunker.

850-6020230908_083200.jpg.30fb960c6682b758fb868d5a608bc890.jpg

The dodgy front buffer beam was removed.

850-6120230908_083210.jpg.4fab947cc5b113d16b3d8d5a3dec5c81.jpg

One can see here, how off line the front footplate is.

850-6220230911_105214.jpg.aef75350954c039e9e2278664d34c0db.jpg

A new buffer beam being setup in tin-plate and the footplate has been corrected.

850-6320230911_123745.jpg.0d1a281baa0a14b987aa9759b65f39cd.jpg

Beam holes drilled and hook slot cut out, now ready to be soldered on.

850-5920230906_104026.jpg.006882fddcc3b22292f66876d0a155d8.jpg

Front valance pieces were made from OO track rail to match that on the body. I did cut brass parts out for this but decided to use the rail instead.

850-6420230911_162903.jpg.307a14ec0a7181c2a505e81064b5fbef.jpg

Footplate chassis frame parts are soldered on.

850-6620230911_162944.jpg.375aa588e161fbf8adff7b2ce4e8013c.jpg

Same with the front valance parts.

850-6720230911_163007.jpg.3eb1b4b460a0e6b8b23e5b01381d0ec9.jpg

850-7120230912_164711.jpg.5ef6f1bb4b76b6d6f7f0e0a73ee5a689.jpg

Chassis mounting tab pre-thinned ready to be solder on the underside of the footplate.

850-7220230912_170749.jpg.b5981c1899d527d7dfd72412e0f07d73.jpg

Clamping arrangement for soldering.

850-7320230912_173558.jpg.46bbcfb93be243548584cc847625b776.jpg

After sorting where the rear screw will be, a hole was drilled in the floor of the bunker for a 6BA nut to be soldered in.

850-7420230912_174010.jpg.c84ddd7921b9609ac7bbbebc98e463dd.jpg

Chassis fitted.

850-6820230911_164930.jpg.8bcc063f93bf51bffa3199c833b22e24.jpg

850-6920230911_170542.jpg.7b9f2c4beaa2cc0fa186b12f19ac86ae.jpg

Drilling holes for the boiler fittings- steam dome, snifting valve and chimney.

850-7020230911_171759.jpg.92f0c077235967779d7385d5a21fcc6c.jpg

Done for now.......

Eoin

  • Like 9
  • WOW! 3
Link to comment
Share on other sites

  • 2 months later...

Time to make up the cylinder parts.

850-7520231122_131853.jpg.3a1dba8fb7f52f623c69db2722f51443.jpg

A stretcher plate was made up and soldered between the frames to mount the cylinders on the chassis and the cylinder covers had their rivets popped.

850-7620231122_131909.jpg.dab7b5a093097c8623414b31ccd7af92.jpg

Two 8BA nuts are soldered to the underside of the stretcher plate for fixing the cylinder assembly.

850-7720231122_142459.jpg.c81e9338550f62aad80f73039c459e81.jpg

The cylinder covers had extra meat on the sides so that the sheets would not distort during the riveting process, this extra was cut off using a piercing saw.

850-7820231122_142514.jpg.0ef3d0cb3ccdc4190c6e48fb663a0f6f.jpg

A bit of cleaning up required but the rivets are right on the edge with no distortion.

850-7920231122_155421.jpg.19a81b40c7eb8e604926b1a3ef86322e.jpg

A bit of bending

850-8020231122_162153.jpg.0b36964d87126024f971075d86f67e26.jpg

850-8120231122_162313.jpg.1fe55e4fdd3b5632013582428d2e5636.jpg

850-8220231122_163433.jpg.d68c4ef63e421dbf7bd41ff0bd01b1e9.jpg

Done.

850-8320231122_165957.jpg.d151a81109aeb8c25ffeeb2e8483ae11.jpg

The cylinder frame was folded up and the covers are adjusted to fit.

850-8520231122_170539.jpg.b27cf00f4fcb933f2fd402b05f8bad5c.jpg

850-8420231122_170518.jpg.c3bc333bdc013322a8948ef61f73bddc.jpg

Having a look

850-8620231127_175037.jpg.a403b74cac5bde02805089de2c126f94.jpg

Next was the cylinder parts, turned up on the lathe.

850-8720231205_115652.jpg.c1cb5181bdb4eb9e33bdec7595df56cc.jpg

The full bunch, complete and ready to test fit.

850-8820231205_120916.jpg.ddff1d5e228796e8a5fe31a21bfd75a4.jpg

A bit of broaching was required but everything works!

850-8920231205_121301.jpg.19f1a7b6f465f8524b8b1a4b5b72dd7a.jpg

850-9020231205_121336.jpg.34e7a0a845e53fbacca4e870f0b58e54.jpg

A few more bits to process and then the lot can be soldered up.......

Eoin.

  • Like 6
  • WOW! 3
Link to comment
Share on other sites

  • 3 months later...

Assembling the cylinders and the motion bracket/plate;-

850-9120240306_164450.jpg.632a93a9c5c9a0f88b8b4458f1a96c14.jpg

These are the bits for the motion bracket, a 4mm dia brass cross bar will hold the plates, the chassis has been drilled to take the bar.

850-9220240306_164646.jpg.d8e8941cbb74f00bfc028995c37b0c5d.jpg

Cross bar threaded through the chassis with the plate to hold the crosshead slide bars test fitted, the fittings below make up the motion hanger plate which will be soldered onto the ends of the crossbar.

850-9320240307_111050.jpg.bb7346b4ccd77e960ff2f2667d557f80.jpg

Filling up the fold line on the steam valve slide bars, the bits are held in a 'Finger Plate' made up many moons ago from mild steel- a very handy tool for holding little bits.

850-9420240307_111105.jpg.1685ff9f1e0dfac11f61403615630af1.jpg

The bits for the motion brackets are folded and prepared for soldering.

850-9520240309_145133.jpg.21c41c254621cf3c7af8cfa090b6afbd.jpg

The plates are pre-thinned with solder and then sweated together in the clamps.

850-9620240309_150043.jpg.20e094a724b1b7ddc8de6b55483bbd75.jpg

Done and needing a bit of a clean up.

850-9720240309_152453.jpg.bdd179de5ede18419f0f5476b6fa274a.jpg

The cylinder wrapper being soldered on the cylinder frame from the inside.

850-9820240309_152527.jpg.f77de21ed78df7e8d9f738e2fcfcbe33.jpg

One on and other one to go.

850-9920240309_164043.jpg.0bd5f4d6807e174201cd9b4524621867.jpg

Then the cylinder turnings are soldered in.

850-10020240309_164103.jpg.c91401ee4c077f8b06952af900746b23.jpg

Complete.

850-10120240316_134754.jpg.eedf68aacd58489cd17a4ead4a2498a4.jpg

850-10220240316_134810.jpg.7acd7ba444630eb5d84bd625df1a3f0f.jpg

The steam cylinder crosshead guides were soldered on, they were held in place with an aluminum jig while soldering in place. And the wheel weights have been installed with epoxy.

I had another computer failure and lost a few photos of that process!!

More later......

Eoin.

  • Like 3
Link to comment
Share on other sites

  • 4 months later...

Setting up the bogie trucks, elec pickup board and brake gear;-

850-10320240506_143110.jpg.7daabaefbe347f5fbbc60f1810b317d7.jpg

The existing truck frames being modified.

850-10420240716_113727.jpg.5758b821cdd0f985e69c3ea7f4699045.jpg

All the truck pivot parts turned up on the lathe, the circular nuts are drilled to hold .6mm NS wire centering springs which work on the little brass wire hoops fitted into the truck frames. The trucks will pivot on a brass bush.

850-10520240716_154451.jpg.c3944c4854edc9c46d8f59edb8f9aabf.jpg

850-10620240716_154557.jpg.32254002476f2b7db3eb656cf0925ec2.jpg

Nuts and wire spring parts soldered onto the frame spacers.

850-10720240716_160048.jpg.c4f3343525ec5ffd967a1d5a7c8ee5f4.jpg

Brass hoops being soldered onto the truck frames.

850-10820240716_161910.jpg.ccf3d0d10a3461403f19128ea91fc8df.jpg

850-10920240716_161929.jpg.935c387f6c2d9a01886c768b73446f4c.jpg

Centering springs are bent to shape and the trucks trial fitted, the trucks pivot on a brass bush screwed fixed through the frame spacers.

850-11120240716_162006.jpg.bf29f90bcded9a2be84133b0be673afc.jpg

Pivot being tested, the truck frames need a slight bend just before the pivot- later!

850-11020240716_161943.jpg.125459c3d58d77c950fc2f9d772d011a.jpg

Done.

850-11220240720_172908.jpg.1141835e8c5a9addfedb026396ad5c13.jpg

Electrical pickups- 10BA nuts are soldered onto the folded up brass frame spacers. The board is a bit of .8mm PCB board CNC'd previously.

850-11320240720_173313.jpg.942f242c39a6ee096e35a728881412e9.jpg

The BCB board is fixed to the frame spacers with 10BA screws to hold in position when soldering the spacers to the chassis frames.

850-11420240720_182729.jpg.992a5030e7638fc8b7b911bfdbbad523.jpg

Soldering complete.

850-11520240805_151657.jpg.e43b222c258aa5bc9965af34530d6ba9.jpg

All the parts for the brake system setup.

850-11620240805_151710.jpg.a99cfdb449e975e9c36c2c14ed556c02.jpg

The brake blocks are CNC'ed from Tufnol and pinned to the hangers with .7mm brass dress pins.

850-11820240813_181608.jpg.29e8a7c6d8408eb4b2abb9ef359cdb01.jpg

850-11720240813_181543.jpg.0bb5514348a46c72143ee35da207057e.jpg

Brake parts test fitted to the chassis.

A few mods are required before soldering, that's for the next installment......

Eoin.

  • Like 5
  • WOW! 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

Terms of Use