Thanks for the feed back.
Regarding the up ramp,
is it fair to make measurement rather than educated guess to rule it
Regarding saddle bottom flat,
I agree with you. If we maintain this argument, we may face that gib
will be either single-point contact to rail bottom flat or to the L bracket
ramp. I imagine your design principle is to have full surface contact on
all associated working surface, rather than point(s) contact.
To the measurement offset parts, HSS rod and balls (uniform radius).
Again, it is not necessary to do this but for point of interest. The
measurement can be made with the saddle removed and turn up side down so
the rod can be hold down by gravity on inverted ^ grove.
If try and error method is allowed,
We can measure the error parallelism for re-machining and finish ground
trim the final error guided by thin layer of scriber paint.
----- Original Message -----
From: Rick Kruger <krugerr@...>
Sent: Sunday, July 01, 2001 9:47 AM
Subject: Re: [7x10minilathe] Tapered Saddle Gibs
: If you mean does the tapered gib move, resulting in the binding by
: up the L bracket ramp, I don't think so. The gib is captured snuggly
: enough in the slot by the screw head, I doubt it can move enough to cause
: the binding.
: As far as whether the saddle bottom flat is parallel to the bed way, I'm
: not sure that would matter either. If the saddle bottom flat is not
: parallel, it would result in a gap on one end of the gib. That gap would
: not change as the carriage moves along the bed; it would remain in a
: orientation to the bed way. I don't see how that could cause binding.
: could cause the saddle to rock and it should be possible to make one
: wiggle. The most my carriage rocks in this manner, using a test
: is 0.0005".
: I believe it is due to the bed way not being uniform: parallel with the
: reference inverted V-way. I think you have the right idea about putting
: something on the V for measuring (how would you hold the rod or balls in
: place in order to get a good measurement?), but I think there is a
: way, which I'll be reporting later today.
: Rick K.
: Portland, OR
: At 04:05 PM 6/30/01 -0700, you wrote:
: >: What I've found is that the bed ways on my minilathe are not
: >: parallel. Since completing the tapered gibs, I found the carriage
: >: on the headstock end of the bed but loose on the tailstock end.
: > This puzzled me too.
: > Could the wedge is driven up ramp by friction?
: > Friction by stock gibs cannot result in tightening action?
: >: Measuring parallelism between the inverted V-way on top and the flat
: >: surface on the under side of the front way is tricky.
: > One way we can do is to place a HSS drill rod (or two measuring
: >balls) on the V grove and add a parallel bar bridging from the rod
: >to the flat way surface....
: > As it was mentioned earlier that it is unnecessary to identify
: >every error parallelism in each section. Instead, all that is required
: >error identify between 3. saddle bottom flat (facing 4) and 9. rail bed
: >flenge bottom (facing 8)
: >1. bed rail top, ^ shape convex
: >2. saddle grove, ^ shape concave
: >3. saddle bottom flat (facing 4)
: >4. L bracket top flat (facing 3)
: >5. L bracket top ramp (facing 6)
: >6. L bracket bottom flat (reference for 3.5)
: >7. wedge bottom ramp (facing 5)
: >8. wedge top flat (facing 9, reference for 5)
: >9. rail bed flange bottom (facing 8)
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