Page 7 of 12 FirstFirst ... 23456789101112 LastLast
Results 91 to 105 of 179
  1. #91
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up Scraping ! Not any more.

    Hi Guys,

    No pictures in this post, just a note to let you know that I have found the problem with the sticking slipping action of the saddle on the grinder base.

    I've spent ages on and off scraping marking and scraping some more ! Well this afternoon I decided to do some more scraping and discovered when I was putting the saddle back onto the base that one of the bearings looked odd. I thought that the spindle pin had come loose, but when I checked it, it was tight.

    So after taking all the bearings off the spindles, I realised that one of the bearings looked thicker than the others. So since I have some spares I put a new one on and refitted all four. The saddle now moves nicely, just like the top slide does. Success !

    When I measured the bearing thickness, I found that it was between three and five thou thicker than the others, but not just across the whole bearing width, its wedge shaped !!! I've never seen this before ! Its very difficult to see but quite measurable with a mic.

    Anyway I now have several thou of clearance under the spindle pins and I'm happy with that.
    Best Regards:
    Baron J.

  2. #92
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up News !

    Hi Guys,

    Way back in post 44, I mentioned that one of the engineering places that I frequent, the foreman mentioned that they had an old band saw in the stores that was requiring some attention. ! More of a hint than anything else, well I visited them today and spoke with the chap that told me about the band saw.

    After a short chat with him and a visit to see the MD and then a visit to the stores to inspect the machine, I am now the proud owner of a 6X4 Taiwanese made band saw, complete with two new spare Bi-metal blades.

    The foreman did point out to the MD that it had never been any good, didn't work and that was why it had been hidden away in a dark corner of the stores and left to stew. It was absolutely filthy and needed a good brushing down and blasting with the air line so that I could have a look at it. Nothing would move so its sized up somewhere, probably the wheels.

    Someone has chopped the mains plug off so I couldn't try it. It no longer runs but it doesn't look like its had any great use. Anyway its mine now and for what I've paid for it I'm not going to argue. I've also got a back handed guarantee. The MD said If it needs anything that I can't sort out then to let the foreman know and they will see what they can do, but I'm still welcome to go and use their big bandsaw.

    I can't wait to get it home and checked out properly. They will drag it out of the stores for me to collect on Wednesday morning. I just hope that it isn't raining then.
    Best Regards:
    Baron J.

  3. #93
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    202

    Default

    I've had one of those Rong Fu bandsaws for a few years now - picked up via Gumtree - I'm sure like me that you'll find it becomes one of the most used machines in you workshop.

  4. #94
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Default

    Hi Guys,

    I got the bandsaw home !

    I'll start a new thread in Metalwork General.

    Thanks:
    Best Regards:
    Baron J.

  5. #95
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Default Cutters !

    Hi Guys,

    I've been waiting for a slot cutter from China for a few weeks now !

    I got an Email from them this morning that tells me that my goods are now in the destination country. Hopefully this means that I will be able to get on with machining the top slide for the TCG soon.
    Best Regards:
    Baron J.

  6. #96
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Default

    Hi Guys.

    Sorry for the delay, its taken a while for the "T" slot cutters to arrive from China, and the 6X4 bandsaw has also taken a great deal of my time.

    My "T" slot cutters arrived in the post this morning, so that means that I can move on with cutting a "T" slot in the top of the table for the work holder. I've also got to machine the knob for the saddle traverse.

    09-08-2019-003.JPG 09-08-2019-005.jpg 09-08-2019-004.JPG
    I had ordered two thickness’s of 18 mm diameter of cutter, one at 4 mm and one at 5 mm. I intend to use the 4 mm thick one and go for a 18 mm wide slot. This will entail cutting a 8 mm deep initial slot of 10 mm width giving me a 4 mm deep top section and a 4 mm deep bottom, 18 mm wide.

    I intend to cut the "T" slot down the centre line of the top slide for the full length of the part. This will enable the work holder to be positioned at any point along the full length of the top slide.

    More to follow. Thanks for following me.
    Best Regards:
    Baron J.

  7. #97
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up "T" Slot.

    Hi Guys,

    Well I've made a start on cutting the "T" slot in the top of the top slide.

    10-08-2019-001.jpg 10-08-2019-002.JPG
    Here the top slide has been placed into the mill vise and checked for squareness and also making sure that it is actually horizontal. I did find that the plate has a 1.2 thou hump down its length. Actually its the same on both sides. But since I'm going to cut a slot down the full length it doesn't matter.

    I've marked the centre line and put an 8 mm slot drill in the chuck. I'm going to take several 2 mm deep cuts and go down to a depth of 8.25 mm. The shaft of the "T" slot cutter is reduced from 10 mm to 8 mm just above the cutter head, so I will open the slot width 0.25 mm on either side after I get to full depth to allow clearance.

    10-08-2019-004.jpg
    Here the initial slot has been cut ready for the slot cutter to machine the bottom of the "T".

    The 8 mm slot drill was run at 750 rpm and the feed rate was 1" inch per minute and a quarter, actually 80 seconds per inch, with a depth of cut of 2 mm. I've been trying lamp oil as the cutting lubricant on this, it seems to work quite well, certainly as good as some others I've tried. The slot drill is one that I bought from China via Banggood. Very cheap and excellent quality.

    I hope the "T" slot cutter is as good.
    Best Regards:
    Baron J.

  8. #98
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    60
    Posts
    4,365

    Default

    Did you at any time whilst cutting the slot try to cut it at full depth?
    The reason I ask is that Woodruff/Tee slot cutter is going to load your mill up, do you have air to blow the chips away whilst cutting, you don't really want the chips clogging the cutter.

  9. #99
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up "T" slot cutting.

    Hi Pipeclay, Guys,

    No I took 2 mm deep bites and a 0.25 mm bite for the last cut, but I was using a paintbrush to clear the chips.
    The "T" slot cutter did take more effort, with lots of lube and brushing, but fairly slow and steady. It took a good half to three quarters of an hour to complete. Your right I should have had a good flow of coolant or air to keep the cutter clear of chips.

    11-08-2019-003.jpg 11-08-2019-002.jpg 11-08-2019-001.jpg
    This is the result. The finish is reasonable, a bit of fettling wont go amiss.

    I'm going to make a length of "T" nut to go in there, should be 18 mm by 8 mm tall with a 4 mm step.
    I'll post pictures when I've made it.

    Thanks Guys.
    Best Regards:
    Baron J.

  10. #100
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up "T" bar.

    Hi Guys,

    Well I've now got the "T" slot done and the length of "T" bar that fits into that slot done and for the time being finished. At some point it will get cut to length, but for the moment its 5.75" inches long. It fits the "T" slot in the top slide perfectly.

    I haven't done a drawing for it but if anybody wants one I will do one.

    14-08-2019-001.jpg 14-08-2019-002.jpg 14-08-2019-003.jpg

    14-08-2019-004.JPG
    The finished item. 18 mm wide by 8 mm tall. A 4 mm thick step, 5 mm wide on each side. Approximately 0.15 mm clearance on each side. Designed for a M6 bolt when I determine where they need to be.

    Next up will be the work holder.

    Thanks for looking.
    Best Regards:
    Baron J.

  11. #101
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    1,334

    Default

    Hi John, that T nut material must have been stress relieved, you were lucky you didn't end up with a banana.

    cheers, shed

  12. #102
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Default

    Hi John,

    That was actually one of my worries when I started to machine it. It was a length of key steel that I had kicking about. It actually came out very nicely.

    I've ordered a ER25 straight shaft collet chuck to use as the tool holder. I had considered making a cartridge spindle using one but I think that it would be too big a diameter.
    Best Regards:
    Baron J.

  13. #103
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up "T" Slot Drawing.

    Hi Guys,

    I've done the drawing for the "T" slot down the middle of the top slide.

    Top Slide 2 .jpgTop Slide 2a .jpg
    NOTE: For some reason the top slide end view is inverted.

    Thanks for looking.
    Best Regards:
    Baron J.

  14. #104
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up Top Slide Traverse !

    Hi Guys,

    I've found some time to do a drawing for the traverse mechanism for the top slide. It basically consists of two brass support blocks holding the ends of an M8 right hand threaded bar acting as a leadscrew. A third brass block acts as the nut and is anchored into the saddle. A knob on the right hand end will be used to turn the screw thus moving the table, in a similar fashion to a mill table.
    Top Slide 3 .png
    If anyone spots an error please let me know.

    Thanks for looking everybody.
    Best Regards:
    Baron J.

  15. #105
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    3,213

    Thumbs up Work Holder base.

    Hi Guys,

    Thank you for your support.

    I've been doing a little work on the work holder base. I've done the drawing for the baseplate that fastens to the top slide via the "T" nut bar.

    Tool Holder 1.png
    I've still to work out the indexing markings, but should have about +- 20 degrees of rotational movement. The base is made from 8 mm thick bright mild steel plate, so should be thick enough not to flex when the actual work holder is fitted.

    Thanks for looking Guys. Your comments are appreciated.
    Best Regards:
    Baron J.

Similar Threads

  1. Hercus tool and cutter grinder & cylindrical grinder.
    By stix012 in forum EBAY, GUMTREE, and other off forum sales sites
    Replies: 1
    Last Post: 23rd Aug 2018, 05:31 PM
  2. Heald internal grinder & Heald Planetary grinder
    By achjimmy in forum METALWORK - Machinery, Equipment, MARKET
    Replies: 2
    Last Post: 11th Oct 2017, 09:22 PM
  3. New to me old grinder.
    By DSEL74 in forum ANTIQUE AND VINTAGE MACHINERY
    Replies: 12
    Last Post: 30th Sep 2016, 08:35 PM
  4. Roller grinder ways/ plain grinder ways
    By Michael G in forum METALWORK GENERAL
    Replies: 11
    Last Post: 6th May 2012, 12:37 AM
  5. Anyone used this Grinder?
    By bwal74 in forum METALWORK GENERAL
    Replies: 6
    Last Post: 10th Apr 2012, 07:47 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •