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| sbwhart:
Thanks Darren and David :wave: Cylinders To drill the bores in the cylinders I’ll again use the rotary table but this time as I want better accuracy, I’ll use the index plates. Rather than getting bogged down trying to explain how the index system works I’ve added a few scans of my table’s instructions. To use an index plate you have to remove the winding handle and replace it with an index plate and a winding handle with an indent. The table has a 90 to 1 ratio (90 turns of the wheel give one rotation of the table) to get the number of turns of the handle you divide 90 by 3 (3 bores required) giving 30 turns as this is a whole number you can use any index plate, as long as you start and finish in the same hole. Setting up the index plate I’m using a mandrel that’s a lose fit in the table, (see crap o cad above) but this time I will centre the mandrel on the RT away from the mill. You just loosely clamp the mandrel to the RT and with the worm disengaged so that the table free wheels, the mandrel is clocked up and adjusted until it runs true, the clamp in tightened up and the mandrel checked again, if its still OK the table is then clamped on the mill. The mill spindle is then centred to the RT, the x and y tables zeroed, I off set the y table by 5/16 for bore position, both tables were then locked Each hole is centre drilled then drilled through with 15/64 followed by a letter D drill which is just under ¼ “Ø, the bore is brought to final size with a hand reamer, this ensures that bore is spot on size. At this stage when you’ve got enough bits it’s always nice to see how it will all fit together. The elbows are only roughly bent square but straight away even with this part assembly you find how important elbow square ness is, the elbows fitted nicely into one cylinder but as soon as you try to assemble them into two the out of square ness locks them up. I’d better get my boots ready to kick them into touch. :bang: :bang: :bang: :D Stew |
| bogstandard:
Stew, I honestly wish I could tell you that from now on is easy, but I would be lying. You have done a very good job so far, so don't rush it at this stage, just take it nice and easy, and you will win. John |
| Divided he ad:
Fair do's Stew..... You're going for this one in a very tidy way! :thumbup: I wouldn't even have thought of my index plates..... But then I'd have probably cocked this up! Reading and learning all the time :) Ralph. |
| NickG:
Stew, This is looking fantastic, :bow: I'm so glad I didn't bother with it, I clearly haven't got the skill required and my parts would no doubt have been sat in the carrier bag, along with the swarf and fluf from the tuble dryer right now! :bang: As Bogs says, just persevere now, take you're time (I am sure you will) :smart: :coffee: and you will win .. then :ddb: :ddb: :ddb: :) :D |
| shoey51:
great work there looking great :thumbup: |
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