To avoid these ads, REGISTER NOW!

Bore Gauge - Will this works?

To avoid these ads, REGISTER NOW!
L

larry_g

Well-known member
Joined
Apr 28, 2007
Messages
16,893
Location
oregon
Do you have micrometers to calibrate it with? That tool alone without some standard to check it against is a good guess. You must have something to check it against. That said if you have micrometers to check it with then you could use snap gauges.

lg
no neat sig line
 
D

DandDMachine

Well-known member
Joined
Feb 22, 2008
Messages
227
Location
Bloomington, MN
I havent used that exact one, but have used several that look identical. I would assume they are all probably made in China. The one I used was pretty decent, I think you will find that the gauge itself is reasonably accurate. Its the setting up of the gauge that can be difficult especially at first until you get used to it. They are only as accurate as the tool and the user that sets them up.

I wouldnt use it for actually doing any machining work where you need consistent repeatable accuracy. If you are only looking to check the sizes or any wear of the bores and double check any clearances then it should work. The best gauges are made by Sunnen and Mitutoyo but they are over $1000. Since you are on a budget that one should work fine. Just be careful to set up properly.
 
L

larry_g

Well-known member
Joined
Apr 28, 2007
Messages
16,893
Location
oregon
cpl said:
ring bore gauge?
how that works?
that's new to me
Click to expand...

A ring guage is a precision known hole size. So if you have a 2.750 ring then check it with your bore guage and confirm the bore guage reads 2.750.

lg
no neat sig line
 
2

2oolhound

Well-known member
Joined
Dec 18, 2010
Messages
5,918
Location
BC Canada
I have a cheap chi model similar to the above. It's great for checking ovality, wear tolerances at top, mid and bottom areas. They are fast and it's easy to read the dial indicator.
I use a mic to find the point with the smallest bore then zero the bore gage there and use it to log all the variances. Keep in mind bore gages won't tell you if 2 cylinders are parallel to each other so you need to account for that when deciding to rebore or not.
 
K

KMScott

Well-known member
Joined
Feb 14, 2012
Messages
4,643
Location
Daufuskie Island, South Carolina
OP
C

cpl

Well-known member
Joined
Apr 30, 2012
Messages
136
Location
Brazil
Thankz everyone.

Now i need a micrometer to calibrate it :)


Now im looking for good machine shop here in brazil to do the boring service.. damnit it's hard to find good shop machine around here :(
 
To avoid these ads, REGISTER NOW!
OP
C

cpl

Well-known member
Joined
Apr 30, 2012
Messages
136
Location
Brazil
Ahh!

Need to buy a good torque wrench to engine building.. and plasticgauge!


Any help?
 
G

GRX

Well-known member
Joined
Dec 4, 2006
Messages
2,032
Location
MD
x2 on a telescoping gauge and correct size mic for your bore size.

And I hate it when people call them "snap gauges". :rolleyes:

41480308SA3jpg_00000006404.jpg


>edit:
Just saw you bought the cheap bore gauge. Let's hope it is good enough quality to measure correctly. As a machinist I never skimp on precision measuring tools.
 
Last edited:
OP
C

cpl

Well-known member
Joined
Apr 30, 2012
Messages
136
Location
Brazil
And a micrometer to measure 75mm..

its better to get 50-75 or 75-100?
 
OP
C

cpl

Well-known member
Joined
Apr 30, 2012
Messages
136
Location
Brazil
My bore is 75mm.

Starret and Snap On are good ones ?

Any store i can bought with international shipping?
 
Last edited:
G

GRX

Well-known member
Joined
Dec 4, 2006
Messages
2,032
Location
MD
If it were me I'd probably opt for the used Mitutoyo. To make use of the whole set you will need a set of mics to check them with. A single telescope gauge and mic may be best if you are on a tight budget. Either telescope gauge or dial bore gauge you will need a micrometer to check with.

For reference 75mm = 2.953 inches.

Snap On are good, Starrett are better - hardened faces. The webpages are linked below. Both are 2-1/8 inch to 3-1/2 inch which will cover your 75mm nicely.
How are tool suppliers in Brazil? Can you buy there?

http://www.starrett.com/metrology/p...-Hand-Tools/Hole-Gages/Telescoping-Gages/229D

http://buy1.snapon.com/catalog/item...roup_ID=675352&store=snapon-store&dir=catalog
 
Last edited:
M

mtnwalton

Well-known member
Joined
Apr 25, 2010
Messages
210
GRX said:
x2 on a telescoping gauge and correct size mic for your bore size.

And I hate it when people call them "snap gauges". :rolleyes:

41480308SA3jpg_00000006404.jpg


>edit:
Just saw you bought the cheap bore gauge. Let's hope it is good enough quality to measure correctly. As a machinist I never skimp on precision measuring tools.
Click to expand...

+1 on the telescoping gauges and good mics
 
G

GRX

Well-known member
Joined
Dec 4, 2006
Messages
2,032
Location
MD
Using telescope gauges does require a certain amount of technique and feel. But once you get it they are great tools for measuring inside diameters.

Here are a couple YouTube videos.

 
G

GRX

Well-known member
Joined
Dec 4, 2006
Messages
2,032
Location
MD
And one more thing ... if and when you buy a micrometer be sure it comes with the standard to ensure proper calibration. Otherwise the tool is useless.
 
OP
C

cpl

Well-known member
Joined
Apr 30, 2012
Messages
136
Location
Brazil
Thankz a lot GRX.


One question about telescoping..

If i'm measuring a bore from the top... and let's say, the bottom of the cylinder is 76mm.. but the top is 75mm..
When i put the telescope on the 76mm.. lock it... and then pull up to check with the mic.. it will hold the 76mm measure after pass the 75mm top of the cylinder right?




About tools here... well.. i can buy some quality stuff around here..but would be too expensive.. it's cheaper to buy online from USA and got it shipped here. Brazil *****, too much taxes.
 
P

Packard V8

Well-known member
Joined
Mar 16, 2009
Messages
7,380
Location
Spokane, WA
cpl said:
One question about telescoping..

If i'm measuring a bore from the top... and let's say, the bottom of the cylinder is 76mm.. but the top is 75mm..
When i put the telescope on the 76mm.. lock it... and then pull up to check with the mic.. it will hold the 76mm measure after pass the 75mm top of the cylinder right?
Click to expand...

Engine bores are nearly always larger at the top than the bottom.

Yes, once you learn the technique, the telescoping gauge can be locked and then tilted to remove from the bore to be measured with a micrometer.

FWIW, inside micrometers do it all in one operation.

And yes, those Chicom dial bore gauges are worth what you pay for them.

jack vines
 
K

KMScott

Well-known member
Joined
Feb 14, 2012
Messages
4,643
Location
Daufuskie Island, South Carolina
Packard V8 said:
Engine bores are nearly always larger at the top than the bottom.
jack vines
Click to expand...

Hi Jack
I do not understand why this is, you can not bore a hole at a taper on purpose but I guess when you lap the bore to add cross hatches you could give the top more time with the Flex or Ball hones. Do engine builders do this? I am curious.

Kevin
 
S

signcrafter

Well-known member
Joined
May 9, 2012
Messages
12,467
Jack actually had a good point with using an inside micrometer, http://www.ebay.com/itm/L-S-Starret...130?pt=LH_DefaultDomain_0&hash=item2329079ce2. The only thing I don't know is I think the ends aren't ball shaped, I believe they are flat like a mic which wouldn't give you a true reading? I have an older set somewhere but can't remember if the ends are round or flat. If they are flat the ends would contact the cylinder walls at the right spots.
 
K

KMScott

Well-known member
Joined
Feb 14, 2012
Messages
4,643
Location
Daufuskie Island, South Carolina
Jack is talking about telescoping gauges, I love them and have used them for years, the best ones I like are the Mitutoyo brand, the set you linking to are inside micrometers and really take a feel for, a little tough when you are reaching deep in a engine block. I am confident in using telescoping gauges as long as I can reach that deep. Again I like using Intrimiks.

http://www.ebay.com/itm/mitutoyo-te...945?pt=LH_DefaultDomain_0&hash=item43b9c67161

http://www.ebay.com/itm/Brown-Sharp...140?pt=LH_DefaultDomain_0&hash=item4d0a744e2c
 
G

GRX

Well-known member
Joined
Dec 4, 2006
Messages
2,032
Location
MD
cpl said:
If i'm measuring a bore from the top... and let's say, the bottom of the cylinder is 76mm.. but the top is 75mm..
When i put the telescope on the 76mm.. lock it... and then pull up to check with the mic.. it will hold the 76mm measure after pass the 75mm top of the cylinder right?
Click to expand...
Like Packard said above, the telescope gauge is tilted. Once you have it in the spot you want to measure you tilt it, remove, then measure. An inside micrometer is a good option also yet just like the dial gauge it still must be checked with an outside mic to ensure accuracy.
KMScott said:
Hi Jack
I do not understand why this is, you can not bore a hole at a taper on purpose but I guess when you lap the bore to add cross hatches you could give the top more time with the Flex or Ball hones. Do engine builders do this? I am curious.

Kevin
Click to expand...
Engine cylinders are machined straight but wear from use makes them bell shaped. 4-stroke cylinders will always be larger near the top since this is where the piston and rings stop. And is where the combustion event happens. 2-strokes will have a different wear pattern due to the location of the air and fuel/oil intake port locations.
 
S

signcrafter

Well-known member
Joined
May 9, 2012
Messages
12,467
Packard V8 said:
Engine bores are nearly always larger at the top than the bottom.

Yes, once you learn the technique, the telescoping gauge can be locked and then tilted to remove from the bore to be measured with a micrometer.

FWIW, inside micrometers do it all in one operation.
And yes, those Chicom dial bore gauges are worth what you pay for them.

jack vines
Click to expand...

KMScott said:
Jack is talking about telescoping gauges,
Click to expand...

He mentioned an inside mic will do it all in one.
 
You must log in or register to reply here.
To avoid these ads, REGISTER NOW!
Top Bottom